January, 1981 | 3.94 | 0 | Dollars per Thousand Cubic Feet |
February, 1981 | 3.99 | + 0.05 | Dollars per Thousand Cubic Feet |
March, 1981 | 4.06 | + 0.069999999999999 | Dollars per Thousand Cubic Feet |
April, 1981 | 4.11 | + 0.050000000000001 | Dollars per Thousand Cubic Feet |
May, 1981 | 4.29 | + 0.18 | Dollars per Thousand Cubic Feet |
June, 1981 | 4.3 | + 0.0099999999999998 | Dollars per Thousand Cubic Feet |
July, 1981 | 4.32 | + 0.02 | Dollars per Thousand Cubic Feet |
August, 1981 | 4.3 | -0.02 | Dollars per Thousand Cubic Feet |
September, 1981 | 4.47 | + 0.17 | Dollars per Thousand Cubic Feet |
October, 1981 | 4.5 | + 0.03 | Dollars per Thousand Cubic Feet |
November, 1981 | 4.53 | + 0.03 | Dollars per Thousand Cubic Feet |
December, 1981 | 4.55 | + 0.02 | Dollars per Thousand Cubic Feet |
January, 1982 | 4.65 | + 0.1 | Dollars per Thousand Cubic Feet |
February, 1982 | 4.69 | + 0.04 | Dollars per Thousand Cubic Feet |
March, 1982 | 4.78 | + 0.09 | Dollars per Thousand Cubic Feet |
April, 1982 | 4.86 | + 0.08 | Dollars per Thousand Cubic Feet |
May, 1982 | 5.17 | + 0.31 | Dollars per Thousand Cubic Feet |
June, 1982 | 5.2 | + 0.03 | Dollars per Thousand Cubic Feet |
July, 1982 | 5.23 | + 0.03 | Dollars per Thousand Cubic Feet |
August, 1982 | 5.23 | 0 | Dollars per Thousand Cubic Feet |
September, 1982 | 5.41 | + 0.18 | Dollars per Thousand Cubic Feet |
October, 1982 | 5.66 | + 0.25 | Dollars per Thousand Cubic Feet |
November, 1982 | 5.68 | + 0.02 | Dollars per Thousand Cubic Feet |
December, 1982 | 5.74 | + 0.06 | Dollars per Thousand Cubic Feet |
January, 1983 | 5.86 | + 0.12 | Dollars per Thousand Cubic Feet |
February, 1983 | 5.87 | + 0.0099999999999998 | Dollars per Thousand Cubic Feet |
March, 1983 | 6 | + 0.13 | Dollars per Thousand Cubic Feet |
April, 1983 | 6.06 | + 0.06 | Dollars per Thousand Cubic Feet |
May, 1983 | 6.22 | + 0.16 | Dollars per Thousand Cubic Feet |
June, 1983 | 6.2 | -0.02 | Dollars per Thousand Cubic Feet |
July, 1983 | 6.21 | + 0.0099999999999998 | Dollars per Thousand Cubic Feet |
August, 1983 | 6.18 | -0.03 | Dollars per Thousand Cubic Feet |
September, 1983 | 6.19 | + 0.010000000000001 | Dollars per Thousand Cubic Feet |
October, 1983 | 6.7 | + 0.51 | Dollars per Thousand Cubic Feet |
November, 1983 | 6.3 | -0.4 | Dollars per Thousand Cubic Feet |
December, 1983 | 5.94 | -0.36 | Dollars per Thousand Cubic Feet |
January, 1984 | 5.78 | -0.16 | Dollars per Thousand Cubic Feet |
February, 1984 | 5.84 | + 0.06 | Dollars per Thousand Cubic Feet |
March, 1984 | 5.92 | + 0.08 | Dollars per Thousand Cubic Feet |
April, 1984 | 5.96 | + 0.04 | Dollars per Thousand Cubic Feet |
May, 1984 | 6.27 | + 0.31 | Dollars per Thousand Cubic Feet |
June, 1984 | 6.76 | + 0.49 | Dollars per Thousand Cubic Feet |
July, 1984 | 7.11 | + 0.35 | Dollars per Thousand Cubic Feet |
August, 1984 | 7.23 | + 0.12 | Dollars per Thousand Cubic Feet |
September, 1984 | 7.17 | -0.06 | Dollars per Thousand Cubic Feet |
October, 1984 | 6.8 | -0.37 | Dollars per Thousand Cubic Feet |
November, 1984 | 6.31 | -0.49 | Dollars per Thousand Cubic Feet |
December, 1984 | 6.05 | -0.26 | Dollars per Thousand Cubic Feet |
January, 1985 | 5.97 | -0.08 | Dollars per Thousand Cubic Feet |
February, 1985 | 5.86 | -0.11 | Dollars per Thousand Cubic Feet |
March, 1985 | 5.99 | + 0.13 | Dollars per Thousand Cubic Feet |
April, 1985 | 6.11 | + 0.12 | Dollars per Thousand Cubic Feet |
May, 1985 | 6.59 | + 0.48 | Dollars per Thousand Cubic Feet |
June, 1985 | 6.96 | + 0.37 | Dollars per Thousand Cubic Feet |
July, 1985 | 7.07 | + 0.11 | Dollars per Thousand Cubic Feet |
August, 1985 | 7.21 | + 0.14 | Dollars per Thousand Cubic Feet |
September, 1985 | 7.06 | -0.15 | Dollars per Thousand Cubic Feet |
October, 1985 | 6.5 | -0.56 | Dollars per Thousand Cubic Feet |
November, 1985 | 6.13 | -0.37 | Dollars per Thousand Cubic Feet |
December, 1985 | 5.7 | -0.43 | Dollars per Thousand Cubic Feet |
January, 1986 | 5.63 | -0.07 | Dollars per Thousand Cubic Feet |
February, 1986 | 5.67 | + 0.04 | Dollars per Thousand Cubic Feet |
March, 1986 | 5.71 | + 0.04 | Dollars per Thousand Cubic Feet |
April, 1986 | 5.89 | + 0.18 | Dollars per Thousand Cubic Feet |
May, 1986 | 6.18 | + 0.29 | Dollars per Thousand Cubic Feet |
June, 1986 | 6.67 | + 0.49 | Dollars per Thousand Cubic Feet |
July, 1986 | 6.84 | + 0.17 | Dollars per Thousand Cubic Feet |
August, 1986 | 6.94 | + 0.1 | Dollars per Thousand Cubic Feet |
September, 1986 | 6.83 | -0.11 | Dollars per Thousand Cubic Feet |
October, 1986 | 6.38 | -0.45 | Dollars per Thousand Cubic Feet |
November, 1986 | 5.66 | -0.72 | Dollars per Thousand Cubic Feet |
December, 1986 | 5.28 | -0.38 | Dollars per Thousand Cubic Feet |
January, 1987 | 5.3 | + 0.02 | Dollars per Thousand Cubic Feet |
February, 1987 | 5.34 | + 0.04 | Dollars per Thousand Cubic Feet |
March, 1987 | 5.36 | + 0.02 | Dollars per Thousand Cubic Feet |
April, 1987 | 5.46 | + 0.1 | Dollars per Thousand Cubic Feet |
May, 1987 | 5.98 | + 0.52 | Dollars per Thousand Cubic Feet |
June, 1987 | 6.55 | + 0.57 | Dollars per Thousand Cubic Feet |
July, 1987 | 6.78 | + 0.23 | Dollars per Thousand Cubic Feet |
August, 1987 | 6.84 | + 0.06 | Dollars per Thousand Cubic Feet |
September, 1987 | 6.64 | -0.2 | Dollars per Thousand Cubic Feet |
October, 1987 | 5.85 | -0.79 | Dollars per Thousand Cubic Feet |
November, 1987 | 5.42 | -0.43 | Dollars per Thousand Cubic Feet |
December, 1987 | 5.13 | -0.29 | Dollars per Thousand Cubic Feet |
January, 1988 | 5.08 | -0.05 | Dollars per Thousand Cubic Feet |
February, 1988 | 5.09 | + 0.0099999999999998 | Dollars per Thousand Cubic Feet |
March, 1988 | 5.18 | + 0.09 | Dollars per Thousand Cubic Feet |
April, 1988 | 5.35 | + 0.17 | Dollars per Thousand Cubic Feet |
May, 1988 | 5.87 | + 0.52 | Dollars per Thousand Cubic Feet |
June, 1988 | 6.5 | + 0.63 | Dollars per Thousand Cubic Feet |
July, 1988 | 6.74 | + 0.24 | Dollars per Thousand Cubic Feet |
August, 1988 | 6.92 | + 0.18 | Dollars per Thousand Cubic Feet |
September, 1988 | 6.79 | -0.13 | Dollars per Thousand Cubic Feet |
October, 1988 | 5.95 | -0.84 | Dollars per Thousand Cubic Feet |
November, 1988 | 5.56 | -0.39 | Dollars per Thousand Cubic Feet |
December, 1988 | 5.39 | -0.17 | Dollars per Thousand Cubic Feet |
January, 1989 | 5.41 | + 0.02 | Dollars per Thousand Cubic Feet |
February, 1989 | 5.38 | -0.03 | Dollars per Thousand Cubic Feet |
March, 1989 | 5.45 | + 0.07 | Dollars per Thousand Cubic Feet |
April, 1989 | 5.54 | + 0.09 | Dollars per Thousand Cubic Feet |
May, 1989 | 5.93 | + 0.39 | Dollars per Thousand Cubic Feet |
June, 1989 | 6.58 | + 0.65 | Dollars per Thousand Cubic Feet |
July, 1989 | 6.92 | + 0.34 | Dollars per Thousand Cubic Feet |
August, 1989 | 7.07 | + 0.15 | Dollars per Thousand Cubic Feet |
September, 1989 | 6.8 | -0.27 | Dollars per Thousand Cubic Feet |
October, 1989 | 6.06 | -0.74 | Dollars per Thousand Cubic Feet |
November, 1989 | 5.56 | -0.5 | Dollars per Thousand Cubic Feet |
December, 1989 | 5.3 | -0.26 | Dollars per Thousand Cubic Feet |
January, 1990 | 5.43 | + 0.13 | Dollars per Thousand Cubic Feet |
February, 1990 | 5.65 | + 0.22 | Dollars per Thousand Cubic Feet |
March, 1990 | 5.6 | -0.050000000000001 | Dollars per Thousand Cubic Feet |
April, 1990 | 5.64 | + 0.04 | Dollars per Thousand Cubic Feet |
May, 1990 | 6 | + 0.36 | Dollars per Thousand Cubic Feet |
June, 1990 | 6.56 | + 0.56 | Dollars per Thousand Cubic Feet |
July, 1990 | 7.04 | + 0.48 | Dollars per Thousand Cubic Feet |
August, 1990 | 7.08 | + 0.04 | Dollars per Thousand Cubic Feet |
September, 1990 | 6.9 | -0.18 | Dollars per Thousand Cubic Feet |
October, 1990 | 6.14 | -0.76 | Dollars per Thousand Cubic Feet |
November, 1990 | 5.69 | -0.45 | Dollars per Thousand Cubic Feet |
December, 1990 | 5.62 | -0.07 | Dollars per Thousand Cubic Feet |
January, 1991 | 5.54 | -0.08 | Dollars per Thousand Cubic Feet |
February, 1991 | 5.56 | + 0.02 | Dollars per Thousand Cubic Feet |
March, 1991 | 5.6 | + 0.04 | Dollars per Thousand Cubic Feet |
April, 1991 | 5.9 | + 0.3 | Dollars per Thousand Cubic Feet |
May, 1991 | 6.28 | + 0.38 | Dollars per Thousand Cubic Feet |
June, 1991 | 6.97 | + 0.69 | Dollars per Thousand Cubic Feet |
July, 1991 | 7.23 | + 0.26 | Dollars per Thousand Cubic Feet |
August, 1991 | 7.36 | + 0.13 | Dollars per Thousand Cubic Feet |
September, 1991 | 6.92 | -0.44 | Dollars per Thousand Cubic Feet |
October, 1991 | 6.2 | -0.72 | Dollars per Thousand Cubic Feet |
November, 1991 | 5.51 | -0.69 | Dollars per Thousand Cubic Feet |
December, 1991 | 5.51 | 0 | Dollars per Thousand Cubic Feet |
January, 1992 | 5.53 | + 0.02 | Dollars per Thousand Cubic Feet |
February, 1992 | 5.54 | + 0.0099999999999998 | Dollars per Thousand Cubic Feet |
March, 1992 | 5.5 | -0.04 | Dollars per Thousand Cubic Feet |
April, 1992 | 5.62 | + 0.12 | Dollars per Thousand Cubic Feet |
May, 1992 | 6.15 | + 0.53 | Dollars per Thousand Cubic Feet |
June, 1992 | 6.84 | + 0.69 | Dollars per Thousand Cubic Feet |
July, 1992 | 7.27 | + 0.43 | Dollars per Thousand Cubic Feet |
August, 1992 | 7.45 | + 0.18 | Dollars per Thousand Cubic Feet |
September, 1992 | 7.15 | -0.3 | Dollars per Thousand Cubic Feet |
October, 1992 | 6.52 | -0.63 | Dollars per Thousand Cubic Feet |
November, 1992 | 6.02 | -0.5 | Dollars per Thousand Cubic Feet |
December, 1992 | 5.74 | -0.28 | Dollars per Thousand Cubic Feet |
January, 1993 | 5.73 | -0.0099999999999998 | Dollars per Thousand Cubic Feet |
February, 1993 | 5.73 | 0 | Dollars per Thousand Cubic Feet |
March, 1993 | 5.67 | -0.06 | Dollars per Thousand Cubic Feet |
April, 1993 | 6.02 | + 0.35 | Dollars per Thousand Cubic Feet |
May, 1993 | 6.78 | + 0.76 | Dollars per Thousand Cubic Feet |
June, 1993 | 7.37 | + 0.59 | Dollars per Thousand Cubic Feet |
July, 1993 | 7.86 | + 0.49 | Dollars per Thousand Cubic Feet |
August, 1993 | 8.13 | + 0.27 | Dollars per Thousand Cubic Feet |
September, 1993 | 7.75 | -0.38 | Dollars per Thousand Cubic Feet |
October, 1993 | 6.79 | -0.96 | Dollars per Thousand Cubic Feet |
November, 1993 | 6.17 | -0.62 | Dollars per Thousand Cubic Feet |
December, 1993 | 6.07 | -0.1 | Dollars per Thousand Cubic Feet |
January, 1994 | 5.93 | -0.14 | Dollars per Thousand Cubic Feet |
February, 1994 | 6.04 | + 0.11 | Dollars per Thousand Cubic Feet |
March, 1994 | 6.3 | + 0.26 | Dollars per Thousand Cubic Feet |
April, 1994 | 6.6 | + 0.3 | Dollars per Thousand Cubic Feet |
May, 1994 | 6.84 | + 0.24 | Dollars per Thousand Cubic Feet |
June, 1994 | 7.66 | + 0.82 | Dollars per Thousand Cubic Feet |
July, 1994 | 8.1 | + 0.44 | Dollars per Thousand Cubic Feet |
August, 1994 | 8.22 | + 0.12 | Dollars per Thousand Cubic Feet |
September, 1994 | 7.84 | -0.38 | Dollars per Thousand Cubic Feet |
October, 1994 | 6.86 | -0.98 | Dollars per Thousand Cubic Feet |
November, 1994 | 6.27 | -0.59 | Dollars per Thousand Cubic Feet |
December, 1994 | 6.06 | -0.21 | Dollars per Thousand Cubic Feet |
January, 1995 | 5.85 | -0.21 | Dollars per Thousand Cubic Feet |
February, 1995 | 5.76 | -0.09 | Dollars per Thousand Cubic Feet |
March, 1995 | 5.84 | + 0.08 | Dollars per Thousand Cubic Feet |
April, 1995 | 6.06 | + 0.22 | Dollars per Thousand Cubic Feet |
May, 1995 | 6.54 | + 0.48 | Dollars per Thousand Cubic Feet |
June, 1995 | 7.49 | + 0.95 | Dollars per Thousand Cubic Feet |
July, 1995 | 7.82 | + 0.33 | Dollars per Thousand Cubic Feet |
August, 1995 | 8.13 | + 0.31 | Dollars per Thousand Cubic Feet |
September, 1995 | 7.73 | -0.4 | Dollars per Thousand Cubic Feet |
October, 1995 | 6.62 | -1.11 | Dollars per Thousand Cubic Feet |
November, 1995 | 5.61 | -1.01 | Dollars per Thousand Cubic Feet |
December, 1995 | 5.54 | -0.07 | Dollars per Thousand Cubic Feet |
January, 1996 | 5.64 | + 0.1 | Dollars per Thousand Cubic Feet |
February, 1996 | 5.82 | + 0.18 | Dollars per Thousand Cubic Feet |
March, 1996 | 5.93 | + 0.11 | Dollars per Thousand Cubic Feet |
April, 1996 | 6.27 | + 0.34 | Dollars per Thousand Cubic Feet |
May, 1996 | 6.84 | + 0.57 | Dollars per Thousand Cubic Feet |
June, 1996 | 7.83 | + 0.99 | Dollars per Thousand Cubic Feet |
July, 1996 | 8.64 | + 0.81 | Dollars per Thousand Cubic Feet |
August, 1996 | 8.73 | + 0.09 | Dollars per Thousand Cubic Feet |
September, 1996 | 7.99 | -0.74 | Dollars per Thousand Cubic Feet |
October, 1996 | 7.05 | -0.94 | Dollars per Thousand Cubic Feet |
November, 1996 | 6.37 | -0.68 | Dollars per Thousand Cubic Feet |
December, 1996 | 6.47 | + 0.1 | Dollars per Thousand Cubic Feet |
January, 1997 | 6.74 | + 0.27 | Dollars per Thousand Cubic Feet |
February, 1997 | 6.79 | + 0.05 | Dollars per Thousand Cubic Feet |
March, 1997 | 6.52 | -0.27 | Dollars per Thousand Cubic Feet |
April, 1997 | 6.53 | + 0.010000000000001 | Dollars per Thousand Cubic Feet |
May, 1997 | 6.83 | + 0.3 | Dollars per Thousand Cubic Feet |
June, 1997 | 8.3 | + 1.47 | Dollars per Thousand Cubic Feet |
July, 1997 | 8.78 | + 0.48 | Dollars per Thousand Cubic Feet |
August, 1997 | 8.99 | + 0.21 | Dollars per Thousand Cubic Feet |
September, 1997 | 8.84 | -0.15 | Dollars per Thousand Cubic Feet |
October, 1997 | 7.69 | -1.15 | Dollars per Thousand Cubic Feet |
November, 1997 | 6.86 | -0.83 | Dollars per Thousand Cubic Feet |
December, 1997 | 6.54 | -0.32 | Dollars per Thousand Cubic Feet |
January, 1998 | 6.41 | -0.13 | Dollars per Thousand Cubic Feet |
February, 1998 | 6.41 | 0 | Dollars per Thousand Cubic Feet |
March, 1998 | 6.29 | -0.12 | Dollars per Thousand Cubic Feet |
April, 1998 | 6.81 | + 0.52 | Dollars per Thousand Cubic Feet |
May, 1998 | 7.7 | + 0.89 | Dollars per Thousand Cubic Feet |
June, 1998 | 8.51 | + 0.81 | Dollars per Thousand Cubic Feet |
July, 1998 | 8.53 | + 0.02 | Dollars per Thousand Cubic Feet |
August, 1998 | 9.25 | + 0.72 | Dollars per Thousand Cubic Feet |
September, 1998 | 8.96 | -0.29 | Dollars per Thousand Cubic Feet |
October, 1998 | 7.6 | -1.36 | Dollars per Thousand Cubic Feet |
November, 1998 | 6.58 | -1.02 | Dollars per Thousand Cubic Feet |
December, 1998 | 6.34 | -0.24 | Dollars per Thousand Cubic Feet |
January, 1999 | 6 | -0.34 | Dollars per Thousand Cubic Feet |
February, 1999 | 6.29 | + 0.29 | Dollars per Thousand Cubic Feet |
March, 1999 | 6.06 | -0.23 | Dollars per Thousand Cubic Feet |
April, 1999 | 6.44 | + 0.38 | Dollars per Thousand Cubic Feet |
May, 1999 | 7.3 | + 0.86 | Dollars per Thousand Cubic Feet |
June, 1999 | 8.2 | + 0.9 | Dollars per Thousand Cubic Feet |
July, 1999 | 8.83 | + 0.63 | Dollars per Thousand Cubic Feet |
August, 1999 | 9.14 | + 0.31 | Dollars per Thousand Cubic Feet |
September, 1999 | 8.63 | -0.51 | Dollars per Thousand Cubic Feet |
October, 1999 | 7.56 | -1.07 | Dollars per Thousand Cubic Feet |
November, 1999 | 7.15 | -0.41 | Dollars per Thousand Cubic Feet |
December, 1999 | 6.51 | -0.64 | Dollars per Thousand Cubic Feet |
January, 2000 | 6.37 | -0.14 | Dollars per Thousand Cubic Feet |
February, 2000 | 6.54 | + 0.17 | Dollars per Thousand Cubic Feet |
March, 2000 | 6.91 | + 0.37 | Dollars per Thousand Cubic Feet |
April, 2000 | 7.19 | + 0.28 | Dollars per Thousand Cubic Feet |
May, 2000 | 8.26 | + 1.07 | Dollars per Thousand Cubic Feet |
June, 2000 | 9.5 | + 1.24 | Dollars per Thousand Cubic Feet |
July, 2000 | 10.32 | + 0.82 | Dollars per Thousand Cubic Feet |
August, 2000 | 10.37 | + 0.049999999999999 | Dollars per Thousand Cubic Feet |
September, 2000 | 10.1 | -0.27 | Dollars per Thousand Cubic Feet |
October, 2000 | 9.44 | -0.66 | Dollars per Thousand Cubic Feet |
November, 2000 | 8.58 | -0.86 | Dollars per Thousand Cubic Feet |
December, 2000 | 8.56 | -0.02 | Dollars per Thousand Cubic Feet |
January, 2001 | 10.12 | + 1.56 | Dollars per Thousand Cubic Feet |
February, 2001 | 10.26 | + 0.14 | Dollars per Thousand Cubic Feet |
March, 2001 | 9.85 | -0.41 | Dollars per Thousand Cubic Feet |
April, 2001 | 10.16 | + 0.31 | Dollars per Thousand Cubic Feet |
May, 2001 | 11.14 | + 0.98 | Dollars per Thousand Cubic Feet |
June, 2001 | 11.58 | + 0.44 | Dollars per Thousand Cubic Feet |
July, 2001 | 11.22 | -0.36 | Dollars per Thousand Cubic Feet |
August, 2001 | 10.89 | -0.33 | Dollars per Thousand Cubic Feet |
September, 2001 | 10.17 | -0.72 | Dollars per Thousand Cubic Feet |
October, 2001 | 8.24 | -1.93 | Dollars per Thousand Cubic Feet |
November, 2001 | 7.98 | -0.26 | Dollars per Thousand Cubic Feet |
December, 2001 | 7.3 | -0.68 | Dollars per Thousand Cubic Feet |
January, 2002 | 7.38 | + 0.08 | Dollars per Thousand Cubic Feet |
February, 2002 | 7.23 | -0.15 | Dollars per Thousand Cubic Feet |
March, 2002 | 7.1 | -0.13 | Dollars per Thousand Cubic Feet |
April, 2002 | 7.66 | + 0.56 | Dollars per Thousand Cubic Feet |
May, 2002 | 8.54 | + 0.88 | Dollars per Thousand Cubic Feet |
June, 2002 | 9.58 | + 1.04 | Dollars per Thousand Cubic Feet |
July, 2002 | 10.31 | + 0.73 | Dollars per Thousand Cubic Feet |
August, 2002 | 10.44 | + 0.13 | Dollars per Thousand Cubic Feet |
September, 2002 | 10.23 | -0.21 | Dollars per Thousand Cubic Feet |
October, 2002 | 8.61 | -1.62 | Dollars per Thousand Cubic Feet |
November, 2002 | 7.99 | -0.62 | Dollars per Thousand Cubic Feet |
December, 2002 | 7.87 | -0.12 | Dollars per Thousand Cubic Feet |
January, 2003 | 8.18 | + 0.31 | Dollars per Thousand Cubic Feet |
February, 2003 | 8.58 | + 0.4 | Dollars per Thousand Cubic Feet |
March, 2003 | 9.77 | + 1.19 | Dollars per Thousand Cubic Feet |
April, 2003 | 10.18 | + 0.41 | Dollars per Thousand Cubic Feet |
May, 2003 | 10.79 | + 0.61 | Dollars per Thousand Cubic Feet |
June, 2003 | 12.08 | + 1.29 | Dollars per Thousand Cubic Feet |
July, 2003 | 12.75 | + 0.67 | Dollars per Thousand Cubic Feet |
August, 2003 | 12.84 | + 0.09 | Dollars per Thousand Cubic Feet |
September, 2003 | 12.31 | -0.53 | Dollars per Thousand Cubic Feet |
October, 2003 | 10.64 | -1.67 | Dollars per Thousand Cubic Feet |
November, 2003 | 9.77 | -0.87 | Dollars per Thousand Cubic Feet |
December, 2003 | 9.51 | -0.26 | Dollars per Thousand Cubic Feet |
January, 2004 | 9.71 | + 0.2 | Dollars per Thousand Cubic Feet |
February, 2004 | 9.85 | + 0.14 | Dollars per Thousand Cubic Feet |
March, 2004 | 10.03 | + 0.18 | Dollars per Thousand Cubic Feet |
April, 2004 | 10.54 | + 0.51 | Dollars per Thousand Cubic Feet |
May, 2004 | 11.63 | + 1.09 | Dollars per Thousand Cubic Feet |
June, 2004 | 13.08 | + 1.45 | Dollars per Thousand Cubic Feet |
July, 2004 | 13.54 | + 0.46 | Dollars per Thousand Cubic Feet |
August, 2004 | 13.74 | + 0.2 | Dollars per Thousand Cubic Feet |
September, 2004 | 13.31 | -0.43 | Dollars per Thousand Cubic Feet |
October, 2004 | 11.69 | -1.62 | Dollars per Thousand Cubic Feet |
November, 2004 | 11.44 | -0.25 | Dollars per Thousand Cubic Feet |
December, 2004 | 11.09 | -0.35 | Dollars per Thousand Cubic Feet |
January, 2005 | 10.9 | -0.19 | Dollars per Thousand Cubic Feet |
February, 2005 | 10.87 | -0.030000000000001 | Dollars per Thousand Cubic Feet |
March, 2005 | 10.84 | -0.029999999999999 | Dollars per Thousand Cubic Feet |
April, 2005 | 11.88 | + 1.04 | Dollars per Thousand Cubic Feet |
May, 2005 | 12.74 | + 0.86 | Dollars per Thousand Cubic Feet |
June, 2005 | 13.79 | + 1.05 | Dollars per Thousand Cubic Feet |
July, 2005 | 14.86 | + 1.07 | Dollars per Thousand Cubic Feet |
August, 2005 | 15.51 | + 0.65 | Dollars per Thousand Cubic Feet |
September, 2005 | 16.56 | + 1.05 | Dollars per Thousand Cubic Feet |
October, 2005 | 16.44 | -0.12 | Dollars per Thousand Cubic Feet |
November, 2005 | 15.64 | -0.8 | Dollars per Thousand Cubic Feet |
December, 2005 | 14.6 | -1.04 | Dollars per Thousand Cubic Feet |
January, 2006 | 14.92 | + 0.32 | Dollars per Thousand Cubic Feet |
February, 2006 | 13.98 | -0.94 | Dollars per Thousand Cubic Feet |
March, 2006 | 13.17 | -0.81 | Dollars per Thousand Cubic Feet |
April, 2006 | 13.27 | + 0.1 | Dollars per Thousand Cubic Feet |
May, 2006 | 14.41 | + 1.14 | Dollars per Thousand Cubic Feet |
June, 2006 | 15.07 | + 0.66 | Dollars per Thousand Cubic Feet |
July, 2006 | 15.72 | + 0.65 | Dollars per Thousand Cubic Feet |
August, 2006 | 16.18 | + 0.46 | Dollars per Thousand Cubic Feet |
September, 2006 | 15.71 | -0.47 | Dollars per Thousand Cubic Feet |
October, 2006 | 12.51 | -3.2 | Dollars per Thousand Cubic Feet |
November, 2006 | 12.45 | -0.06 | Dollars per Thousand Cubic Feet |
December, 2006 | 12.53 | + 0.08 | Dollars per Thousand Cubic Feet |
January, 2007 | 12.17 | -0.36 | Dollars per Thousand Cubic Feet |
February, 2007 | 12.13 | -0.039999999999999 | Dollars per Thousand Cubic Feet |
March, 2007 | 12.81 | + 0.68 | Dollars per Thousand Cubic Feet |
April, 2007 | 13.31 | + 0.5 | Dollars per Thousand Cubic Feet |
May, 2007 | 14.69 | + 1.38 | Dollars per Thousand Cubic Feet |
June, 2007 | 16.28 | + 1.59 | Dollars per Thousand Cubic Feet |
July, 2007 | 16.71 | + 0.43 | Dollars per Thousand Cubic Feet |
August, 2007 | 16.71 | 0 | Dollars per Thousand Cubic Feet |
September, 2007 | 16.03 | -0.68 | Dollars per Thousand Cubic Feet |
October, 2007 | 14.57 | -1.46 | Dollars per Thousand Cubic Feet |
November, 2007 | 13.04 | -1.53 | Dollars per Thousand Cubic Feet |
December, 2007 | 12.34 | -0.7 | Dollars per Thousand Cubic Feet |
January, 2008 | 12.24 | -0.1 | Dollars per Thousand Cubic Feet |
February, 2008 | 12.58 | + 0.34 | Dollars per Thousand Cubic Feet |
March, 2008 | 13.13 | + 0.55 | Dollars per Thousand Cubic Feet |
April, 2008 | 14.49 | + 1.36 | Dollars per Thousand Cubic Feet |
May, 2008 | 16.33 | + 1.84 | Dollars per Thousand Cubic Feet |
June, 2008 | 18.91 | + 2.58 | Dollars per Thousand Cubic Feet |
July, 2008 | 20.77 | + 1.86 | Dollars per Thousand Cubic Feet |
August, 2008 | 20.17 | -0.6 | Dollars per Thousand Cubic Feet |
September, 2008 | 18.41 | -1.76 | Dollars per Thousand Cubic Feet |
October, 2008 | 15.45 | -2.96 | Dollars per Thousand Cubic Feet |
November, 2008 | 13.8 | -1.65 | Dollars per Thousand Cubic Feet |
December, 2008 | 12.84 | -0.96 | Dollars per Thousand Cubic Feet |
January, 2009 | 12.49 | -0.35 | Dollars per Thousand Cubic Feet |
February, 2009 | 12.26 | -0.23 | Dollars per Thousand Cubic Feet |
March, 2009 | 11.98 | -0.28 | Dollars per Thousand Cubic Feet |
April, 2009 | 11.68 | -0.3 | Dollars per Thousand Cubic Feet |
May, 2009 | 12.86 | + 1.18 | Dollars per Thousand Cubic Feet |
June, 2009 | 14.26 | + 1.4 | Dollars per Thousand Cubic Feet |
July, 2009 | 15.27 | + 1.01 | Dollars per Thousand Cubic Feet |
August, 2009 | 15.61 | + 0.34 | Dollars per Thousand Cubic Feet |
September, 2009 | 14.8 | -0.81 | Dollars per Thousand Cubic Feet |
October, 2009 | 11.78 | -3.02 | Dollars per Thousand Cubic Feet |
November, 2009 | 11.48 | -0.3 | Dollars per Thousand Cubic Feet |
December, 2009 | 10.42 | -1.06 | Dollars per Thousand Cubic Feet |
January, 2010 | 10.56 | + 0.14 | Dollars per Thousand Cubic Feet |
February, 2010 | 10.69 | + 0.13 | Dollars per Thousand Cubic Feet |
March, 2010 | 10.99 | + 0.3 | Dollars per Thousand Cubic Feet |
April, 2010 | 11.97 | + 0.98 | Dollars per Thousand Cubic Feet |
May, 2010 | 13.12 | + 1.15 | Dollars per Thousand Cubic Feet |
June, 2010 | 14.86 | + 1.74 | Dollars per Thousand Cubic Feet |
July, 2010 | 16.21 | + 1.35 | Dollars per Thousand Cubic Feet |
August, 2010 | 16.65 | + 0.44 | Dollars per Thousand Cubic Feet |
September, 2010 | 15.63 | -1.02 | Dollars per Thousand Cubic Feet |
October, 2010 | 13.37 | -2.26 | Dollars per Thousand Cubic Feet |
November, 2010 | 10.89 | -2.48 | Dollars per Thousand Cubic Feet |
December, 2010 | 9.98 | -0.91 | Dollars per Thousand Cubic Feet |
January, 2011 | 9.9 | -0.08 | Dollars per Thousand Cubic Feet |
February, 2011 | 10.14 | + 0.24 | Dollars per Thousand Cubic Feet |
March, 2011 | 10.43 | + 0.29 | Dollars per Thousand Cubic Feet |
April, 2011 | 11.27 | + 0.84 | Dollars per Thousand Cubic Feet |
May, 2011 | 12.5 | + 1.23 | Dollars per Thousand Cubic Feet |
June, 2011 | 14.7 | + 2.2 | Dollars per Thousand Cubic Feet |
July, 2011 | 16.14 | + 1.44 | Dollars per Thousand Cubic Feet |
August, 2011 | 16.67 | + 0.53 | Dollars per Thousand Cubic Feet |
September, 2011 | 15.63 | -1.04 | Dollars per Thousand Cubic Feet |
October, 2011 | 12.85 | -2.78 | Dollars per Thousand Cubic Feet |
November, 2011 | 10.78 | -2.07 | Dollars per Thousand Cubic Feet |
December, 2011 | 9.83 | -0.95 | Dollars per Thousand Cubic Feet |
January, 2012 | 9.62 | -0.21 | Dollars per Thousand Cubic Feet |
February, 2012 | 9.47 | -0.15 | Dollars per Thousand Cubic Feet |
March, 2012 | 10.41 | + 0.94 | Dollars per Thousand Cubic Feet |
April, 2012 | 10.94 | + 0.53 | Dollars per Thousand Cubic Feet |
May, 2012 | 12.61 | + 1.67 | Dollars per Thousand Cubic Feet |
June, 2012 | 14.18 | + 1.57 | Dollars per Thousand Cubic Feet |
July, 2012 | 15.13 | + 0.95 | Dollars per Thousand Cubic Feet |
August, 2012 | 15.82 | + 0.69 | Dollars per Thousand Cubic Feet |
September, 2012 | 14.72 | -1.1 | Dollars per Thousand Cubic Feet |
October, 2012 | 11.68 | -3.04 | Dollars per Thousand Cubic Feet |
November, 2012 | 9.99 | -1.69 | Dollars per Thousand Cubic Feet |
December, 2012 | 9.8 | -0.19 | Dollars per Thousand Cubic Feet |
January, 2013 | 9.15 | -0.65 | Dollars per Thousand Cubic Feet |
February, 2013 | 9.23 | + 0.08 | Dollars per Thousand Cubic Feet |
March, 2013 | 9.35 | + 0.12 | Dollars per Thousand Cubic Feet |
April, 2013 | 10.43 | + 1.08 | Dollars per Thousand Cubic Feet |
May, 2013 | 12.61 | + 2.18 | Dollars per Thousand Cubic Feet |
June, 2013 | 15.02 | + 2.41 | Dollars per Thousand Cubic Feet |
July, 2013 | 16.3 | + 1.28 | Dollars per Thousand Cubic Feet |
August, 2013 | 16.43 | + 0.13 | Dollars per Thousand Cubic Feet |
September, 2013 | 15.69 | -0.74 | Dollars per Thousand Cubic Feet |
October, 2013 | 12.38 | -3.31 | Dollars per Thousand Cubic Feet |
November, 2013 | 10.04 | -2.34 | Dollars per Thousand Cubic Feet |
December, 2013 | 9.14 | -0.9 | Dollars per Thousand Cubic Feet |
January, 2014 | 9.26 | + 0.12 | Dollars per Thousand Cubic Feet |
February, 2014 | 9.77 | + 0.51 | Dollars per Thousand Cubic Feet |
March, 2014 | 10.7 | + 0.93 | Dollars per Thousand Cubic Feet |
April, 2014 | 11.76 | + 1.06 | Dollars per Thousand Cubic Feet |
May, 2014 | 13.6 | + 1.84 | Dollars per Thousand Cubic Feet |
June, 2014 | 16.13 | + 2.53 | Dollars per Thousand Cubic Feet |
July, 2014 | 17.23 | + 1.1 | Dollars per Thousand Cubic Feet |
August, 2014 | 17.41 | + 0.18 | Dollars per Thousand Cubic Feet |
September, 2014 | 16.27 | -1.14 | Dollars per Thousand Cubic Feet |
October, 2014 | 13.11 | -3.16 | Dollars per Thousand Cubic Feet |
November, 2014 | 10.19 | -2.92 | Dollars per Thousand Cubic Feet |
December, 2014 | 10.01 | -0.18 | Dollars per Thousand Cubic Feet |
January, 2015 | 9.5 | -0.51 | Dollars per Thousand Cubic Feet |
February, 2015 | 9.08 | -0.42 | Dollars per Thousand Cubic Feet |
March, 2015 | 9.28 | + 0.2 | Dollars per Thousand Cubic Feet |
April, 2015 | 10.43 | + 1.15 | Dollars per Thousand Cubic Feet |
May, 2015 | 12.73 | + 2.3 | Dollars per Thousand Cubic Feet |
June, 2015 | 15.07 | + 2.34 | Dollars per Thousand Cubic Feet |
July, 2015 | 16.28 | + 1.21 | Dollars per Thousand Cubic Feet |
August, 2015 | 16.88 | + 0.6 | Dollars per Thousand Cubic Feet |
September, 2015 | 16.4 | -0.48 | Dollars per Thousand Cubic Feet |
October, 2015 | 12.6 | -3.8 | Dollars per Thousand Cubic Feet |
November, 2015 | 10.02 | -2.58 | Dollars per Thousand Cubic Feet |
December, 2015 | 9.27 | -0.75 | Dollars per Thousand Cubic Feet |
January, 2016 | 8.28 | -0.99 | Dollars per Thousand Cubic Feet |
February, 2016 | 8.36 | + 0.08 | Dollars per Thousand Cubic Feet |
March, 2016 | 9.19 | + 0.83 | Dollars per Thousand Cubic Feet |
April, 2016 | 9.65 | + 0.46 | Dollars per Thousand Cubic Feet |
May, 2016 | 11.62 | + 1.97 | Dollars per Thousand Cubic Feet |
June, 2016 | 14.43 | + 2.81 | Dollars per Thousand Cubic Feet |
July, 2016 | 16.56 | + 2.13 | Dollars per Thousand Cubic Feet |
August, 2016 | 17.6 | + 1.04 | Dollars per Thousand Cubic Feet |
September, 2016 | 16.78 | -0.82 | Dollars per Thousand Cubic Feet |
October, 2016 | 13.74 | -3.04 | Dollars per Thousand Cubic Feet |
November, 2016 | 10.77 | -2.97 | Dollars per Thousand Cubic Feet |
December, 2016 | 9.06 | -1.71 | Dollars per Thousand Cubic Feet |
January, 2017 | 9.32 | + 0.26 | Dollars per Thousand Cubic Feet |
February, 2017 | 10.01 | + 0.69 | Dollars per Thousand Cubic Feet |
March, 2017 | 9.86 | -0.15 | Dollars per Thousand Cubic Feet |
April, 2017 | 11.34 | + 1.48 | Dollars per Thousand Cubic Feet |
May, 2017 | 13.25 | + 1.91 | Dollars per Thousand Cubic Feet |
June, 2017 | 16.06 | + 2.81 | Dollars per Thousand Cubic Feet |
July, 2017 | 17.86 | + 1.8 | Dollars per Thousand Cubic Feet |
August, 2017 | 18.22 | + 0.36 | Dollars per Thousand Cubic Feet |
September, 2017 | 16.92 | -1.3 | Dollars per Thousand Cubic Feet |
October, 2017 | 13.39 | -3.53 | Dollars per Thousand Cubic Feet |
November, 2017 | 10.14 | -3.25 | Dollars per Thousand Cubic Feet |
December, 2017 | 9.29 | -0.85 | Dollars per Thousand Cubic Feet |
January, 2018 | 8.9 | -0.39 | Dollars per Thousand Cubic Feet |
February, 2018 | 9.63 | + 0.73 | Dollars per Thousand Cubic Feet |
March, 2018 | 9.76 | + 0.13 | Dollars per Thousand Cubic Feet |
April, 2018 | 10.05 | + 0.29 | Dollars per Thousand Cubic Feet |
May, 2018 | 13.52 | + 3.47 | Dollars per Thousand Cubic Feet |
June, 2018 | 16.47 | + 2.95 | Dollars per Thousand Cubic Feet |
July, 2018 | 17.85 | + 1.38 | Dollars per Thousand Cubic Feet |
August, 2018 | 18.56 | + 0.71 | Dollars per Thousand Cubic Feet |
September, 2018 | 17.23 | -1.33 | Dollars per Thousand Cubic Feet |
October, 2018 | 12.22 | -5.01 | Dollars per Thousand Cubic Feet |
November, 2018 | 9.42 | -2.8 | Dollars per Thousand Cubic Feet |
December, 2018 | 9.62 | + 0.2 | Dollars per Thousand Cubic Feet |
January, 2019 | 9.36 | -0.26 | Dollars per Thousand Cubic Feet |
February, 2019 | 9.4 | + 0.040000000000001 | Dollars per Thousand Cubic Feet |
March, 2019 | 9.42 | + 0.02 | Dollars per Thousand Cubic Feet |
April, 2019 | 10.85 | + 1.43 | Dollars per Thousand Cubic Feet |
May, 2019 | 12.76 | + 1.91 | Dollars per Thousand Cubic Feet |
June, 2019 | 15.55 | + 2.79 | Dollars per Thousand Cubic Feet |
July, 2019 | 17.74 | + 2.19 | Dollars per Thousand Cubic Feet |
August, 2019 | 18.38 | + 0.64 | Dollars per Thousand Cubic Feet |
September, 2019 | 17.61 | -0.77 | Dollars per Thousand Cubic Feet |
October, 2019 | 12.5 | -5.11 | Dollars per Thousand Cubic Feet |
November, 2019 | 9.33 | -3.17 | Dollars per Thousand Cubic Feet |
December, 2019 | 9.3 | -0.029999999999999 | Dollars per Thousand Cubic Feet |
January, 2020 | 9.51 | + 0.21 | Dollars per Thousand Cubic Feet |
February, 2020 | 9.12 | -0.39 | Dollars per Thousand Cubic Feet |
March, 2020 | 9.85 | + 0.73 | Dollars per Thousand Cubic Feet |
April, 2020 | 10.66 | + 0.81 | Dollars per Thousand Cubic Feet |
May, 2020 | 11.85 | + 1.19 | Dollars per Thousand Cubic Feet |
June, 2020 | 15.37 | + 3.52 | Dollars per Thousand Cubic Feet |
July, 2020 | 17.63 | + 2.26 | Dollars per Thousand Cubic Feet |
August, 2020 | 18.42 | + 0.79 | Dollars per Thousand Cubic Feet |
September, 2020 | 16.99 | -1.43 | Dollars per Thousand Cubic Feet |
October, 2020 | 12.36 | -4.63 | Dollars per Thousand Cubic Feet |
November, 2020 | 11.07 | -1.29 | Dollars per Thousand Cubic Feet |
December, 2020 | 9.81 | -1.26 | Dollars per Thousand Cubic Feet |
January, 2021 | 9.74 | -0.07 | Dollars per Thousand Cubic Feet |
February, 2021 | 9.37 | -0.37 | Dollars per Thousand Cubic Feet |
March, 2021 | 10.55 | + 1.18 | Dollars per Thousand Cubic Feet |