January, 1976 | 0.54 | 0 | Dollars per Thousand Cubic Feet |
February, 1976 | 0.54 | 0 | Dollars per Thousand Cubic Feet |
March, 1976 | 0.54 | 0 | Dollars per Thousand Cubic Feet |
April, 1976 | 0.55 | + 0.01 | Dollars per Thousand Cubic Feet |
May, 1976 | 0.55 | 0 | Dollars per Thousand Cubic Feet |
June, 1976 | 0.58 | + 0.03 | Dollars per Thousand Cubic Feet |
July, 1976 | 0.58 | 0 | Dollars per Thousand Cubic Feet |
August, 1976 | 0.6 | + 0.02 | Dollars per Thousand Cubic Feet |
September, 1976 | 0.6 | 0 | Dollars per Thousand Cubic Feet |
October, 1976 | 0.62 | + 0.02 | Dollars per Thousand Cubic Feet |
November, 1976 | 0.63 | + 0.01 | Dollars per Thousand Cubic Feet |
December, 1976 | 0.64 | + 0.01 | Dollars per Thousand Cubic Feet |
January, 1977 | 0.67 | + 0.03 | Dollars per Thousand Cubic Feet |
February, 1977 | 0.71 | + 0.04 | Dollars per Thousand Cubic Feet |
March, 1977 | 0.75 | + 0.04 | Dollars per Thousand Cubic Feet |
April, 1977 | 0.77 | + 0.02 | Dollars per Thousand Cubic Feet |
May, 1977 | 0.77 | 0 | Dollars per Thousand Cubic Feet |
June, 1977 | 0.82 | + 0.05 | Dollars per Thousand Cubic Feet |
July, 1977 | 0.83 | + 0.01 | Dollars per Thousand Cubic Feet |
August, 1977 | 0.82 | -0.01 | Dollars per Thousand Cubic Feet |
September, 1977 | 0.83 | + 0.01 | Dollars per Thousand Cubic Feet |
October, 1977 | 0.84 | + 0.01 | Dollars per Thousand Cubic Feet |
November, 1977 | 0.83 | -0.01 | Dollars per Thousand Cubic Feet |
December, 1977 | 0.84 | + 0.01 | Dollars per Thousand Cubic Feet |
January, 1978 | 0.87 | + 0.03 | Dollars per Thousand Cubic Feet |
February, 1978 | 0.88 | + 0.01 | Dollars per Thousand Cubic Feet |
March, 1978 | 0.89 | + 0.01 | Dollars per Thousand Cubic Feet |
April, 1978 | 0.88 | -0.01 | Dollars per Thousand Cubic Feet |
May, 1978 | 0.91 | + 0.03 | Dollars per Thousand Cubic Feet |
June, 1978 | 0.91 | 0 | Dollars per Thousand Cubic Feet |
July, 1978 | 0.89 | -0.02 | Dollars per Thousand Cubic Feet |
August, 1978 | 0.91 | + 0.02 | Dollars per Thousand Cubic Feet |
September, 1978 | 0.92 | + 0.01 | Dollars per Thousand Cubic Feet |
October, 1978 | 0.92 | 0 | Dollars per Thousand Cubic Feet |
November, 1978 | 0.93 | + 0.01 | Dollars per Thousand Cubic Feet |
December, 1978 | 0.96 | + 0.03 | Dollars per Thousand Cubic Feet |
January, 1979 | 1.02 | + 0.06 | Dollars per Thousand Cubic Feet |
February, 1979 | 1.05 | + 0.03 | Dollars per Thousand Cubic Feet |
March, 1979 | 1.1 | + 0.05 | Dollars per Thousand Cubic Feet |
April, 1979 | 1.11 | + 0.01 | Dollars per Thousand Cubic Feet |
May, 1979 | 1.15 | + 0.04 | Dollars per Thousand Cubic Feet |
June, 1979 | 1.17 | + 0.02 | Dollars per Thousand Cubic Feet |
July, 1979 | 1.2 | + 0.03 | Dollars per Thousand Cubic Feet |
August, 1979 | 1.24 | + 0.04 | Dollars per Thousand Cubic Feet |
September, 1979 | 1.24 | 0 | Dollars per Thousand Cubic Feet |
October, 1979 | 1.28 | + 0.04 | Dollars per Thousand Cubic Feet |
November, 1979 | 1.29 | + 0.01 | Dollars per Thousand Cubic Feet |
December, 1979 | 1.31 | + 0.02 | Dollars per Thousand Cubic Feet |
January, 1980 | 1.37 | + 0.06 | Dollars per Thousand Cubic Feet |
February, 1980 | 1.42 | + 0.05 | Dollars per Thousand Cubic Feet |
March, 1980 | 1.46 | + 0.04 | Dollars per Thousand Cubic Feet |
April, 1980 | 1.51 | + 0.05 | Dollars per Thousand Cubic Feet |
May, 1980 | 1.56 | + 0.05 | Dollars per Thousand Cubic Feet |
June, 1980 | 1.57 | + 0.01 | Dollars per Thousand Cubic Feet |
July, 1980 | 1.64 | + 0.07 | Dollars per Thousand Cubic Feet |
August, 1980 | 1.64 | 0 | Dollars per Thousand Cubic Feet |
September, 1980 | 1.69 | + 0.05 | Dollars per Thousand Cubic Feet |
October, 1980 | 1.71 | + 0.02 | Dollars per Thousand Cubic Feet |
November, 1980 | 1.76 | + 0.05 | Dollars per Thousand Cubic Feet |
December, 1980 | 1.74 | -0.02 | Dollars per Thousand Cubic Feet |
January, 1981 | 1.77 | + 0.03 | Dollars per Thousand Cubic Feet |
February, 1981 | 1.81 | + 0.04 | Dollars per Thousand Cubic Feet |
March, 1981 | 1.86 | + 0.05 | Dollars per Thousand Cubic Feet |
April, 1981 | 1.93 | + 0.07 | Dollars per Thousand Cubic Feet |
May, 1981 | 1.95 | + 0.02 | Dollars per Thousand Cubic Feet |
June, 1981 | 1.95 | 0 | Dollars per Thousand Cubic Feet |
July, 1981 | 2.01 | + 0.06 | Dollars per Thousand Cubic Feet |
August, 1981 | 2.02 | + 0.01 | Dollars per Thousand Cubic Feet |
September, 1981 | 2.08 | + 0.06 | Dollars per Thousand Cubic Feet |
October, 1981 | 2.11 | + 0.03 | Dollars per Thousand Cubic Feet |
November, 1981 | 2.15 | + 0.04 | Dollars per Thousand Cubic Feet |
December, 1981 | 2.16 | + 0.01 | Dollars per Thousand Cubic Feet |
January, 1982 | 2.23 | + 0.07 | Dollars per Thousand Cubic Feet |
February, 1982 | 2.3 | + 0.07 | Dollars per Thousand Cubic Feet |
March, 1982 | 2.35 | + 0.05 | Dollars per Thousand Cubic Feet |
April, 1982 | 2.4 | + 0.05 | Dollars per Thousand Cubic Feet |
May, 1982 | 2.45 | + 0.05 | Dollars per Thousand Cubic Feet |
June, 1982 | 2.45 | 0 | Dollars per Thousand Cubic Feet |
July, 1982 | 2.47 | + 0.02 | Dollars per Thousand Cubic Feet |
August, 1982 | 2.53 | + 0.06 | Dollars per Thousand Cubic Feet |
September, 1982 | 2.56 | + 0.03 | Dollars per Thousand Cubic Feet |
October, 1982 | 2.6 | + 0.04 | Dollars per Thousand Cubic Feet |
November, 1982 | 2.62 | + 0.02 | Dollars per Thousand Cubic Feet |
December, 1982 | 2.62 | 0 | Dollars per Thousand Cubic Feet |
January, 1983 | 2.66 | + 0.04 | Dollars per Thousand Cubic Feet |
February, 1983 | 2.66 | 0 | Dollars per Thousand Cubic Feet |
March, 1983 | 2.58 | -0.08 | Dollars per Thousand Cubic Feet |
April, 1983 | 2.53 | -0.05 | Dollars per Thousand Cubic Feet |
May, 1983 | 2.53 | 0 | Dollars per Thousand Cubic Feet |
June, 1983 | 2.59 | + 0.06 | Dollars per Thousand Cubic Feet |
July, 1983 | 2.52 | -0.07 | Dollars per Thousand Cubic Feet |
August, 1983 | 2.58 | + 0.06 | Dollars per Thousand Cubic Feet |
September, 1983 | 2.67 | + 0.09 | Dollars per Thousand Cubic Feet |
October, 1983 | 2.58 | -0.09 | Dollars per Thousand Cubic Feet |
November, 1983 | 2.6 | + 0.02 | Dollars per Thousand Cubic Feet |
December, 1983 | 2.61 | + 0.0099999999999998 | Dollars per Thousand Cubic Feet |
January, 1984 | 2.67 | + 0.06 | Dollars per Thousand Cubic Feet |
February, 1984 | 2.71 | + 0.04 | Dollars per Thousand Cubic Feet |
March, 1984 | 2.67 | -0.04 | Dollars per Thousand Cubic Feet |
April, 1984 | 2.64 | -0.03 | Dollars per Thousand Cubic Feet |
May, 1984 | 2.67 | + 0.03 | Dollars per Thousand Cubic Feet |
June, 1984 | 2.7 | + 0.03 | Dollars per Thousand Cubic Feet |
July, 1984 | 2.68 | -0.02 | Dollars per Thousand Cubic Feet |
August, 1984 | 2.69 | + 0.0099999999999998 | Dollars per Thousand Cubic Feet |
September, 1984 | 2.62 | -0.07 | Dollars per Thousand Cubic Feet |
October, 1984 | 2.63 | + 0.0099999999999998 | Dollars per Thousand Cubic Feet |
November, 1984 | 2.61 | -0.02 | Dollars per Thousand Cubic Feet |
December, 1984 | 2.57 | -0.04 | Dollars per Thousand Cubic Feet |
January, 1985 | 2.64 | + 0.07 | Dollars per Thousand Cubic Feet |
February, 1985 | 2.71 | + 0.07 | Dollars per Thousand Cubic Feet |
March, 1985 | 2.62 | -0.09 | Dollars per Thousand Cubic Feet |
April, 1985 | 2.64 | + 0.02 | Dollars per Thousand Cubic Feet |
May, 1985 | 2.53 | -0.11 | Dollars per Thousand Cubic Feet |
June, 1985 | 2.58 | + 0.05 | Dollars per Thousand Cubic Feet |
July, 1985 | 2.51 | -0.07 | Dollars per Thousand Cubic Feet |
August, 1985 | 2.47 | -0.04 | Dollars per Thousand Cubic Feet |
September, 1985 | 2.42 | -0.05 | Dollars per Thousand Cubic Feet |
October, 1985 | 2.37 | -0.05 | Dollars per Thousand Cubic Feet |
November, 1985 | 2.36 | -0.01 | Dollars per Thousand Cubic Feet |
December, 1985 | 2.28 | -0.08 | Dollars per Thousand Cubic Feet |
January, 1986 | 2.28 | 0 | Dollars per Thousand Cubic Feet |
February, 1986 | 2.26 | -0.02 | Dollars per Thousand Cubic Feet |
March, 1986 | 2.16 | -0.1 | Dollars per Thousand Cubic Feet |
April, 1986 | 2.1 | -0.06 | Dollars per Thousand Cubic Feet |
May, 1986 | 1.96 | -0.14 | Dollars per Thousand Cubic Feet |
June, 1986 | 1.85 | -0.11 | Dollars per Thousand Cubic Feet |
July, 1986 | 1.8 | -0.05 | Dollars per Thousand Cubic Feet |
August, 1986 | 1.77 | -0.03 | Dollars per Thousand Cubic Feet |
September, 1986 | 1.78 | + 0.01 | Dollars per Thousand Cubic Feet |
October, 1986 | 1.73 | -0.05 | Dollars per Thousand Cubic Feet |
November, 1986 | 1.77 | + 0.04 | Dollars per Thousand Cubic Feet |
December, 1986 | 1.76 | -0.01 | Dollars per Thousand Cubic Feet |
January, 1987 | 1.74 | -0.02 | Dollars per Thousand Cubic Feet |
February, 1987 | 1.73 | -0.01 | Dollars per Thousand Cubic Feet |
March, 1987 | 1.73 | 0 | Dollars per Thousand Cubic Feet |
April, 1987 | 1.69 | -0.04 | Dollars per Thousand Cubic Feet |
May, 1987 | 1.65 | -0.04 | Dollars per Thousand Cubic Feet |
June, 1987 | 1.65 | 0 | Dollars per Thousand Cubic Feet |
July, 1987 | 1.66 | + 0.01 | Dollars per Thousand Cubic Feet |
August, 1987 | 1.63 | -0.03 | Dollars per Thousand Cubic Feet |
September, 1987 | 1.56 | -0.07 | Dollars per Thousand Cubic Feet |
October, 1987 | 1.57 | + 0.01 | Dollars per Thousand Cubic Feet |
November, 1987 | 1.64 | + 0.07 | Dollars per Thousand Cubic Feet |
December, 1987 | 1.7 | + 0.06 | Dollars per Thousand Cubic Feet |
January, 1988 | 1.96 | + 0.26 | Dollars per Thousand Cubic Feet |
February, 1988 | 1.84 | -0.12 | Dollars per Thousand Cubic Feet |
March, 1988 | 1.7 | -0.14 | Dollars per Thousand Cubic Feet |
April, 1988 | 1.59 | -0.11 | Dollars per Thousand Cubic Feet |
May, 1988 | 1.52 | -0.07 | Dollars per Thousand Cubic Feet |
June, 1988 | 1.53 | + 0.01 | Dollars per Thousand Cubic Feet |
July, 1988 | 1.56 | + 0.03 | Dollars per Thousand Cubic Feet |
August, 1988 | 1.62 | + 0.06 | Dollars per Thousand Cubic Feet |
September, 1988 | 1.53 | -0.09 | Dollars per Thousand Cubic Feet |
October, 1988 | 1.68 | + 0.15 | Dollars per Thousand Cubic Feet |
November, 1988 | 1.76 | + 0.08 | Dollars per Thousand Cubic Feet |
December, 1988 | 1.89 | + 0.13 | Dollars per Thousand Cubic Feet |
January, 1989 | 1.99 | + 0.1 | Dollars per Thousand Cubic Feet |
February, 1989 | 1.81 | -0.18 | Dollars per Thousand Cubic Feet |
March, 1989 | 1.69 | -0.12 | Dollars per Thousand Cubic Feet |
April, 1989 | 1.56 | -0.13 | Dollars per Thousand Cubic Feet |
May, 1989 | 1.61 | + 0.05 | Dollars per Thousand Cubic Feet |
June, 1989 | 1.65 | + 0.04 | Dollars per Thousand Cubic Feet |
July, 1989 | 1.65 | 0 | Dollars per Thousand Cubic Feet |
August, 1989 | 1.61 | -0.04 | Dollars per Thousand Cubic Feet |
September, 1989 | 1.55 | -0.06 | Dollars per Thousand Cubic Feet |
October, 1989 | 1.58 | + 0.03 | Dollars per Thousand Cubic Feet |
November, 1989 | 1.66 | + 0.08 | Dollars per Thousand Cubic Feet |
December, 1989 | 1.92 | + 0.26 | Dollars per Thousand Cubic Feet |
January, 1990 | 2.23 | + 0.31 | Dollars per Thousand Cubic Feet |
February, 1990 | 1.85 | -0.38 | Dollars per Thousand Cubic Feet |
March, 1990 | 1.55 | -0.3 | Dollars per Thousand Cubic Feet |
April, 1990 | 1.49 | -0.06 | Dollars per Thousand Cubic Feet |
May, 1990 | 1.47 | -0.02 | Dollars per Thousand Cubic Feet |
June, 1990 | 1.48 | + 0.01 | Dollars per Thousand Cubic Feet |
July, 1990 | 1.49 | + 0.01 | Dollars per Thousand Cubic Feet |
August, 1990 | 1.51 | + 0.02 | Dollars per Thousand Cubic Feet |
September, 1990 | 1.56 | + 0.05 | Dollars per Thousand Cubic Feet |
October, 1990 | 1.76 | + 0.2 | Dollars per Thousand Cubic Feet |
November, 1990 | 1.94 | + 0.18 | Dollars per Thousand Cubic Feet |
December, 1990 | 2.04 | + 0.1 | Dollars per Thousand Cubic Feet |
January, 1991 | 1.96 | -0.08 | Dollars per Thousand Cubic Feet |
February, 1991 | 1.62 | -0.34 | Dollars per Thousand Cubic Feet |
March, 1991 | 1.49 | -0.13 | Dollars per Thousand Cubic Feet |
April, 1991 | 1.5 | + 0.01 | Dollars per Thousand Cubic Feet |
May, 1991 | 1.48 | -0.02 | Dollars per Thousand Cubic Feet |
June, 1991 | 1.43 | -0.05 | Dollars per Thousand Cubic Feet |
July, 1991 | 1.34 | -0.09 | Dollars per Thousand Cubic Feet |
August, 1991 | 1.43 | + 0.09 | Dollars per Thousand Cubic Feet |
September, 1991 | 1.59 | + 0.16 | Dollars per Thousand Cubic Feet |
October, 1991 | 1.82 | + 0.23 | Dollars per Thousand Cubic Feet |
November, 1991 | 1.89 | + 0.07 | Dollars per Thousand Cubic Feet |
December, 1991 | 2 | + 0.11 | Dollars per Thousand Cubic Feet |
January, 1992 | 1.74 | -0.26 | Dollars per Thousand Cubic Feet |
February, 1992 | 1.26 | -0.48 | Dollars per Thousand Cubic Feet |
March, 1992 | 1.35 | + 0.09 | Dollars per Thousand Cubic Feet |
April, 1992 | 1.42 | + 0.07 | Dollars per Thousand Cubic Feet |
May, 1992 | 1.51 | + 0.09 | Dollars per Thousand Cubic Feet |
June, 1992 | 1.62 | + 0.11 | Dollars per Thousand Cubic Feet |
July, 1992 | 1.55 | -0.07 | Dollars per Thousand Cubic Feet |
August, 1992 | 1.84 | + 0.29 | Dollars per Thousand Cubic Feet |
September, 1992 | 1.92 | + 0.08 | Dollars per Thousand Cubic Feet |
October, 1992 | 2.38 | + 0.46 | Dollars per Thousand Cubic Feet |
November, 1992 | 2.13 | -0.25 | Dollars per Thousand Cubic Feet |
December, 1992 | 2.07 | -0.06 | Dollars per Thousand Cubic Feet |
January, 1993 | 2.03 | -0.04 | Dollars per Thousand Cubic Feet |
February, 1993 | 1.93 | -0.1 | Dollars per Thousand Cubic Feet |
March, 1993 | 2 | + 0.07 | Dollars per Thousand Cubic Feet |
April, 1993 | 2.06 | + 0.06 | Dollars per Thousand Cubic Feet |
May, 1993 | 2.18 | + 0.12 | Dollars per Thousand Cubic Feet |
June, 1993 | 1.98 | -0.2 | Dollars per Thousand Cubic Feet |
July, 1993 | 1.99 | + 0.01 | Dollars per Thousand Cubic Feet |
August, 1993 | 2.04 | + 0.05 | Dollars per Thousand Cubic Feet |
September, 1993 | 2.09 | + 0.05 | Dollars per Thousand Cubic Feet |
October, 1993 | 2.02 | -0.07 | Dollars per Thousand Cubic Feet |
November, 1993 | 2.03 | + 0.0099999999999998 | Dollars per Thousand Cubic Feet |
December, 1993 | 2.15 | + 0.12 | Dollars per Thousand Cubic Feet |
January, 1994 | 1.93 | -0.22 | Dollars per Thousand Cubic Feet |
February, 1994 | 1.88 | -0.05 | Dollars per Thousand Cubic Feet |
March, 1994 | 1.93 | + 0.05 | Dollars per Thousand Cubic Feet |
April, 1994 | 1.91 | -0.02 | Dollars per Thousand Cubic Feet |
May, 1994 | 2 | + 0.09 | Dollars per Thousand Cubic Feet |
June, 1994 | 1.8 | -0.2 | Dollars per Thousand Cubic Feet |
July, 1994 | 1.81 | + 0.01 | Dollars per Thousand Cubic Feet |
August, 1994 | 1.83 | + 0.02 | Dollars per Thousand Cubic Feet |
September, 1994 | 1.78 | -0.05 | Dollars per Thousand Cubic Feet |
October, 1994 | 1.7 | -0.08 | Dollars per Thousand Cubic Feet |
November, 1994 | 1.75 | + 0.05 | Dollars per Thousand Cubic Feet |
December, 1994 | 1.88 | + 0.13 | Dollars per Thousand Cubic Feet |
January, 1995 | 1.62 | -0.26 | Dollars per Thousand Cubic Feet |
February, 1995 | 1.48 | -0.14 | Dollars per Thousand Cubic Feet |
March, 1995 | 1.47 | -0.01 | Dollars per Thousand Cubic Feet |
April, 1995 | 1.52 | + 0.05 | Dollars per Thousand Cubic Feet |
May, 1995 | 1.55 | + 0.03 | Dollars per Thousand Cubic Feet |
June, 1995 | 1.58 | + 0.03 | Dollars per Thousand Cubic Feet |
July, 1995 | 1.43 | -0.15 | Dollars per Thousand Cubic Feet |
August, 1995 | 1.43 | 0 | Dollars per Thousand Cubic Feet |
September, 1995 | 1.52 | + 0.09 | Dollars per Thousand Cubic Feet |
October, 1995 | 1.54 | + 0.02 | Dollars per Thousand Cubic Feet |
November, 1995 | 1.61 | + 0.07 | Dollars per Thousand Cubic Feet |
December, 1995 | 1.84 | + 0.23 | Dollars per Thousand Cubic Feet |
January, 1996 | 2.05 | + 0.21 | Dollars per Thousand Cubic Feet |
February, 1996 | 1.89 | -0.16 | Dollars per Thousand Cubic Feet |
March, 1996 | 1.95 | + 0.06 | Dollars per Thousand Cubic Feet |
April, 1996 | 2.08 | + 0.13 | Dollars per Thousand Cubic Feet |
May, 1996 | 2.01 | -0.07 | Dollars per Thousand Cubic Feet |
June, 1996 | 2.08 | + 0.07 | Dollars per Thousand Cubic Feet |
July, 1996 | 2.25 | + 0.17 | Dollars per Thousand Cubic Feet |
August, 1996 | 2.1 | -0.15 | Dollars per Thousand Cubic Feet |
September, 1996 | 1.85 | -0.25 | Dollars per Thousand Cubic Feet |
October, 1996 | 1.94 | + 0.09 | Dollars per Thousand Cubic Feet |
November, 1996 | 2.5 | + 0.56 | Dollars per Thousand Cubic Feet |
December, 1996 | 3.26 | + 0.76 | Dollars per Thousand Cubic Feet |
January, 1997 | 3.4 | + 0.14 | Dollars per Thousand Cubic Feet |
February, 1997 | 2.49 | -0.91 | Dollars per Thousand Cubic Feet |
March, 1997 | 1.79 | -0.7 | Dollars per Thousand Cubic Feet |
April, 1997 | 1.81 | + 0.02 | Dollars per Thousand Cubic Feet |
May, 1997 | 2 | + 0.19 | Dollars per Thousand Cubic Feet |
June, 1997 | 2.08 | + 0.08 | Dollars per Thousand Cubic Feet |
July, 1997 | 2 | -0.08 | Dollars per Thousand Cubic Feet |
August, 1997 | 2.08 | + 0.08 | Dollars per Thousand Cubic Feet |
September, 1997 | 2.33 | + 0.25 | Dollars per Thousand Cubic Feet |
October, 1997 | 2.68 | + 0.35 | Dollars per Thousand Cubic Feet |
November, 1997 | 2.92 | + 0.24 | Dollars per Thousand Cubic Feet |
December, 1997 | 2.28 | -0.64 | Dollars per Thousand Cubic Feet |
January, 1998 | 1.96 | -0.32 | Dollars per Thousand Cubic Feet |
February, 1998 | 1.96 | 0 | Dollars per Thousand Cubic Feet |
March, 1998 | 2.06 | + 0.1 | Dollars per Thousand Cubic Feet |
April, 1998 | 2.16 | + 0.1 | Dollars per Thousand Cubic Feet |
May, 1998 | 2.04 | -0.12 | Dollars per Thousand Cubic Feet |
June, 1998 | 1.91 | -0.13 | Dollars per Thousand Cubic Feet |
July, 1998 | 2.09 | + 0.18 | Dollars per Thousand Cubic Feet |
August, 1998 | 1.82 | -0.27 | Dollars per Thousand Cubic Feet |
September, 1998 | 1.7 | -0.12 | Dollars per Thousand Cubic Feet |
October, 1998 | 1.86 | + 0.16 | Dollars per Thousand Cubic Feet |
November, 1998 | 1.94 | + 0.08 | Dollars per Thousand Cubic Feet |
December, 1998 | 1.95 | + 0.01 | Dollars per Thousand Cubic Feet |
January, 1999 | 1.85 | -0.1 | Dollars per Thousand Cubic Feet |
February, 1999 | 1.77 | -0.08 | Dollars per Thousand Cubic Feet |
March, 1999 | 1.7 | -0.07 | Dollars per Thousand Cubic Feet |
April, 1999 | 1.9 | + 0.2 | Dollars per Thousand Cubic Feet |
May, 1999 | 2.17 | + 0.27 | Dollars per Thousand Cubic Feet |
June, 1999 | 2.14 | -0.03 | Dollars per Thousand Cubic Feet |
July, 1999 | 2.2 | + 0.06 | Dollars per Thousand Cubic Feet |
August, 1999 | 2.51 | + 0.31 | Dollars per Thousand Cubic Feet |
September, 1999 | 2.62 | + 0.11 | Dollars per Thousand Cubic Feet |
October, 1999 | 2.52 | -0.1 | Dollars per Thousand Cubic Feet |
November, 1999 | 2.68 | + 0.16 | Dollars per Thousand Cubic Feet |
December, 1999 | 2.24 | -0.44 | Dollars per Thousand Cubic Feet |
January, 2000 | 2.6 | + 0.36 | Dollars per Thousand Cubic Feet |
February, 2000 | 2.73 | + 0.13 | Dollars per Thousand Cubic Feet |
March, 2000 | 2.66 | -0.07 | Dollars per Thousand Cubic Feet |
April, 2000 | 2.86 | + 0.2 | Dollars per Thousand Cubic Feet |
May, 2000 | 3.04 | + 0.18 | Dollars per Thousand Cubic Feet |
June, 2000 | 3.77 | + 0.73 | Dollars per Thousand Cubic Feet |
July, 2000 | 3.84 | + 0.07 | Dollars per Thousand Cubic Feet |
August, 2000 | 3.73 | -0.11 | Dollars per Thousand Cubic Feet |
September, 2000 | 4.26 | + 0.53 | Dollars per Thousand Cubic Feet |
October, 2000 | 4.58 | + 0.32 | Dollars per Thousand Cubic Feet |
November, 2000 | 4.4 | -0.18 | Dollars per Thousand Cubic Feet |
December, 2000 | 5.77 | + 1.37 | Dollars per Thousand Cubic Feet |
January, 2001 | 6.82 | + 1.05 | Dollars per Thousand Cubic Feet |
February, 2001 | 5.08 | -1.74 | Dollars per Thousand Cubic Feet |
March, 2001 | 4.37 | -0.71 | Dollars per Thousand Cubic Feet |
April, 2001 | 4.52 | + 0.15 | Dollars per Thousand Cubic Feet |
May, 2001 | 4.36 | -0.16 | Dollars per Thousand Cubic Feet |
June, 2001 | 3.79 | -0.57 | Dollars per Thousand Cubic Feet |
July, 2001 | 3.35 | -0.44 | Dollars per Thousand Cubic Feet |
August, 2001 | 3.33 | -0.02 | Dollars per Thousand Cubic Feet |
September, 2001 | 2.93 | -0.4 | Dollars per Thousand Cubic Feet |
October, 2001 | 2.78 | -0.15 | Dollars per Thousand Cubic Feet |
November, 2001 | 3.41 | + 0.63 | Dollars per Thousand Cubic Feet |
December, 2001 | 3.42 | + 0.0099999999999998 | Dollars per Thousand Cubic Feet |
January, 2002 | 2.5 | -0.92 | Dollars per Thousand Cubic Feet |
February, 2002 | 2.19 | -0.31 | Dollars per Thousand Cubic Feet |
March, 2002 | 2.4 | + 0.21 | Dollars per Thousand Cubic Feet |
April, 2002 | 2.94 | + 0.54 | Dollars per Thousand Cubic Feet |
May, 2002 | 2.94 | 0 | Dollars per Thousand Cubic Feet |
June, 2002 | 2.96 | + 0.02 | Dollars per Thousand Cubic Feet |
July, 2002 | 2.92 | -0.04 | Dollars per Thousand Cubic Feet |
August, 2002 | 2.76 | -0.16 | Dollars per Thousand Cubic Feet |
September, 2002 | 2.97 | + 0.21 | Dollars per Thousand Cubic Feet |
October, 2002 | 3.24 | + 0.27 | Dollars per Thousand Cubic Feet |
November, 2002 | 3.59 | + 0.35 | Dollars per Thousand Cubic Feet |
December, 2002 | 3.96 | + 0.37 | Dollars per Thousand Cubic Feet |
January, 2003 | 4.43 | + 0.47 | Dollars per Thousand Cubic Feet |
February, 2003 | 5.05 | + 0.62 | Dollars per Thousand Cubic Feet |
March, 2003 | 6.96 | + 1.91 | Dollars per Thousand Cubic Feet |
April, 2003 | 4.47 | -2.49 | Dollars per Thousand Cubic Feet |
May, 2003 | 4.77 | + 0.3 | Dollars per Thousand Cubic Feet |
June, 2003 | 5.41 | + 0.64 | Dollars per Thousand Cubic Feet |
July, 2003 | 5.08 | -0.33 | Dollars per Thousand Cubic Feet |
August, 2003 | 4.46 | -0.62 | Dollars per Thousand Cubic Feet |
September, 2003 | 4.59 | + 0.13 | Dollars per Thousand Cubic Feet |
October, 2003 | 4.32 | -0.27 | Dollars per Thousand Cubic Feet |
November, 2003 | 4.26 | -0.06 | Dollars per Thousand Cubic Feet |
December, 2003 | 4.76 | + 0.5 | Dollars per Thousand Cubic Feet |
January, 2004 | 5.21 | + 0.45 | Dollars per Thousand Cubic Feet |
February, 2004 | 5.02 | -0.19 | Dollars per Thousand Cubic Feet |
March, 2004 | 5.12 | + 0.1 | Dollars per Thousand Cubic Feet |
April, 2004 | 5.03 | -0.09 | Dollars per Thousand Cubic Feet |
May, 2004 | 5.4 | + 0.37 | Dollars per Thousand Cubic Feet |
June, 2004 | 5.82 | + 0.42 | Dollars per Thousand Cubic Feet |
July, 2004 | 5.62 | -0.2 | Dollars per Thousand Cubic Feet |
August, 2004 | 5.52 | -0.1 | Dollars per Thousand Cubic Feet |
September, 2004 | 5.06 | -0.46 | Dollars per Thousand Cubic Feet |
October, 2004 | 5.43 | + 0.37 | Dollars per Thousand Cubic Feet |
November, 2004 | 6.21 | + 0.78 | Dollars per Thousand Cubic Feet |
December, 2004 | 6.01 | -0.2 | Dollars per Thousand Cubic Feet |
January, 2005 | 5.8 | -0.21 | Dollars per Thousand Cubic Feet |
February, 2005 | 5.73 | -0.069999999999999 | Dollars per Thousand Cubic Feet |
March, 2005 | 5.95 | + 0.22 | Dollars per Thousand Cubic Feet |
April, 2005 | 6.57 | + 0.62 | Dollars per Thousand Cubic Feet |
May, 2005 | 6.25 | -0.32 | Dollars per Thousand Cubic Feet |
June, 2005 | 6.09 | -0.16 | Dollars per Thousand Cubic Feet |
July, 2005 | 6.71 | + 0.62 | Dollars per Thousand Cubic Feet |
August, 2005 | 6.48 | -0.23 | Dollars per Thousand Cubic Feet |
September, 2005 | 8.95 | + 2.47 | Dollars per Thousand Cubic Feet |
October, 2005 | 10.33 | + 1.38 | Dollars per Thousand Cubic Feet |
November, 2005 | 9.89 | -0.44 | Dollars per Thousand Cubic Feet |
December, 2005 | 9.08 | -0.81 | Dollars per Thousand Cubic Feet |
January, 2006 | 8.01 | -1.07 | Dollars per Thousand Cubic Feet |
February, 2006 | 6.85 | -1.16 | Dollars per Thousand Cubic Feet |
March, 2006 | 6.43 | -0.42 | Dollars per Thousand Cubic Feet |
April, 2006 | 6.37 | -0.06 | Dollars per Thousand Cubic Feet |
May, 2006 | 6.23 | -0.14 | Dollars per Thousand Cubic Feet |
June, 2006 | 5.77 | -0.46 | Dollars per Thousand Cubic Feet |
July, 2006 | 5.91 | + 0.14 | Dollars per Thousand Cubic Feet |
August, 2006 | 6.55 | + 0.64 | Dollars per Thousand Cubic Feet |
September, 2006 | 6.06 | -0.49 | Dollars per Thousand Cubic Feet |
October, 2006 | 5.09 | -0.97 | Dollars per Thousand Cubic Feet |
November, 2006 | 6.71 | + 1.62 | Dollars per Thousand Cubic Feet |
December, 2006 | 6.76 | + 0.05 | Dollars per Thousand Cubic Feet |
January, 2007 | 5.7 | -1.06 | Dollars per Thousand Cubic Feet |
February, 2007 | 6.8 | + 1.1 | Dollars per Thousand Cubic Feet |
March, 2007 | 6.65 | -0.15 | Dollars per Thousand Cubic Feet |
April, 2007 | 6.26 | -0.39 | Dollars per Thousand Cubic Feet |
May, 2007 | 6.75 | + 0.49 | Dollars per Thousand Cubic Feet |
June, 2007 | 6.62 | -0.13 | Dollars per Thousand Cubic Feet |
July, 2007 | 6.21 | -0.41 | Dollars per Thousand Cubic Feet |
August, 2007 | 5.76 | -0.45 | Dollars per Thousand Cubic Feet |
September, 2007 | 5.3 | -0.46 | Dollars per Thousand Cubic Feet |
October, 2007 | 5.78 | + 0.48 | Dollars per Thousand Cubic Feet |
November, 2007 | 6.46 | + 0.68 | Dollars per Thousand Cubic Feet |
December, 2007 | 6.87 | + 0.41 | Dollars per Thousand Cubic Feet |
January, 2008 | 7.38 | + 0.51 | Dollars per Thousand Cubic Feet |
February, 2008 | 8.02 | + 0.64 | Dollars per Thousand Cubic Feet |
March, 2008 | 8.63 | + 0.61 | Dollars per Thousand Cubic Feet |
April, 2008 | 8.87 | + 0.24 | Dollars per Thousand Cubic Feet |
May, 2008 | 9.96 | + 1.09 | Dollars per Thousand Cubic Feet |
June, 2008 | 10.36 | + 0.4 | Dollars per Thousand Cubic Feet |
July, 2008 | 10.79 | + 0.43 | Dollars per Thousand Cubic Feet |
August, 2008 | 8.21 | -2.58 | Dollars per Thousand Cubic Feet |
September, 2008 | 6.71 | -1.5 | Dollars per Thousand Cubic Feet |
October, 2008 | 5.64 | -1.07 | Dollars per Thousand Cubic Feet |
November, 2008 | 5.23 | -0.41 | Dollars per Thousand Cubic Feet |
December, 2008 | 5.94 | + 0.71 | Dollars per Thousand Cubic Feet |
January, 2009 | 4.6 | -1.34 | Dollars per Thousand Cubic Feet |
February, 2009 | 3.7 | -0.9 | Dollars per Thousand Cubic Feet |
March, 2009 | 3.38 | -0.32 | Dollars per Thousand Cubic Feet |
April, 2009 | 3.18 | -0.2 | Dollars per Thousand Cubic Feet |
May, 2009 | 3.23 | + 0.05 | Dollars per Thousand Cubic Feet |
June, 2009 | 3.38 | + 0.15 | Dollars per Thousand Cubic Feet |
July, 2009 | 3.45 | + 0.07 | Dollars per Thousand Cubic Feet |
August, 2009 | 3.37 | -0.08 | Dollars per Thousand Cubic Feet |
September, 2009 | 2.98 | -0.39 | Dollars per Thousand Cubic Feet |
October, 2009 | 3.83 | + 0.85 | Dollars per Thousand Cubic Feet |
November, 2009 | 4.2 | + 0.37 | Dollars per Thousand Cubic Feet |
December, 2009 | 4.66 | + 0.46 | Dollars per Thousand Cubic Feet |
January, 2010 | 5.69 | + 1.03 | Dollars per Thousand Cubic Feet |
February, 2010 | 5.3 | -0.39 | Dollars per Thousand Cubic Feet |
March, 2010 | 4.7 | -0.6 | Dollars per Thousand Cubic Feet |
April, 2010 | 4.1 | -0.6 | Dollars per Thousand Cubic Feet |
May, 2010 | 4.24 | + 0.14 | Dollars per Thousand Cubic Feet |
June, 2010 | 4.27 | + 0.029999999999999 | Dollars per Thousand Cubic Feet |
July, 2010 | 4.44 | + 0.17 | Dollars per Thousand Cubic Feet |
August, 2010 | 4.38 | -0.06 | Dollars per Thousand Cubic Feet |
September, 2010 | 3.83 | -0.55 | Dollars per Thousand Cubic Feet |
October, 2010 | 4.05 | + 0.22 | Dollars per Thousand Cubic Feet |
November, 2010 | 4.12 | + 0.07 | Dollars per Thousand Cubic Feet |
December, 2010 | 4.68 | + 0.56 | Dollars per Thousand Cubic Feet |
January, 2011 | 4.37 | -0.31 | Dollars per Thousand Cubic Feet |
February, 2011 | 4.34 | -0.03 | Dollars per Thousand Cubic Feet |
March, 2011 | 3.95 | -0.39 | Dollars per Thousand Cubic Feet |
April, 2011 | 4.05 | + 0.1 | Dollars per Thousand Cubic Feet |
May, 2011 | 4.12 | + 0.07 | Dollars per Thousand Cubic Feet |
June, 2011 | 4.2 | + 0.08 | Dollars per Thousand Cubic Feet |
July, 2011 | 4.27 | + 0.069999999999999 | Dollars per Thousand Cubic Feet |
August, 2011 | 4.2 | -0.069999999999999 | Dollars per Thousand Cubic Feet |
September, 2011 | 3.82 | -0.38 | Dollars per Thousand Cubic Feet |
October, 2011 | 3.62 | -0.2 | Dollars per Thousand Cubic Feet |
November, 2011 | 3.35 | -0.27 | Dollars per Thousand Cubic Feet |
December, 2011 | 3.14 | -0.21 | Dollars per Thousand Cubic Feet |
January, 2012 | 2.89 | -0.25 | Dollars per Thousand Cubic Feet |
February, 2012 | 2.46 | -0.43 | Dollars per Thousand Cubic Feet |
March, 2012 | 2.25 | -0.21 | Dollars per Thousand Cubic Feet |
April, 2012 | 1.89 | -0.36 | Dollars per Thousand Cubic Feet |
May, 2012 | 1.94 | + 0.05 | Dollars per Thousand Cubic Feet |
June, 2012 | 2.54 | + 0.6 | Dollars per Thousand Cubic Feet |
July, 2012 | 2.59 | + 0.05 | Dollars per Thousand Cubic Feet |
August, 2012 | 2.86 | + 0.27 | Dollars per Thousand Cubic Feet |
September, 2012 | 2.71 | -0.15 | Dollars per Thousand Cubic Feet |
October, 2012 | 3.03 | + 0.32 | Dollars per Thousand Cubic Feet |
November, 2012 | 3.35 | + 0.32 | Dollars per Thousand Cubic Feet |
December, 2012 | 3.35 | 0 | Dollars per Thousand Cubic Feet |