1949 | 24.263 | 0 | Million Btu per Short Ton |
1950 | 24.461 | + 0.198 | Million Btu per Short Ton |
1951 | 24.281 | -0.18 | Million Btu per Short Ton |
1952 | 24.371 | + 0.09 | Million Btu per Short Ton |
1953 | 24.383 | + 0.012 | Million Btu per Short Ton |
1954 | 24.362 | -0.021000000000001 | Million Btu per Short Ton |
1955 | 24.373 | + 0.011000000000003 | Million Btu per Short Ton |
1956 | 24.195 | -0.178 | Million Btu per Short Ton |
1957 | 24.238 | + 0.042999999999999 | Million Btu per Short Ton |
1958 | 24.287 | + 0.048999999999999 | Million Btu per Short Ton |
1959 | 24.224 | -0.062999999999999 | Million Btu per Short Ton |
1960 | 24.226 | + 0.0019999999999989 | Million Btu per Short Ton |
1961 | 24.248 | + 0.022000000000002 | Million Btu per Short Ton |
1962 | 24.173 | -0.075000000000003 | Million Btu per Short Ton |
1963 | 24.033 | -0.14 | Million Btu per Short Ton |
1964 | 24.037 | + 0.0039999999999978 | Million Btu per Short Ton |
1965 | 24.028 | -0.0090000000000003 | Million Btu per Short Ton |
1966 | 23.915 | -0.113 | Million Btu per Short Ton |
1967 | 23.685 | -0.23 | Million Btu per Short Ton |
1968 | 23.621 | -0.064 | Million Btu per Short Ton |
1969 | 23.474 | -0.147 | Million Btu per Short Ton |
1970 | 23.203 | -0.271 | Million Btu per Short Ton |
1971 | 23.09 | -0.113 | Million Btu per Short Ton |
1972 | 22.998 | -0.091999999999999 | Million Btu per Short Ton |
1973 | 22.831 | -0.167 | Million Btu per Short Ton |
1974 | 22.479 | -0.352 | Million Btu per Short Ton |
1975 | 22.261 | -0.218 | Million Btu per Short Ton |
1976 | 22.774 | + 0.513 | Million Btu per Short Ton |
1977 | 22.919 | + 0.145 | Million Btu per Short Ton |
1978 | 22.466 | -0.453 | Million Btu per Short Ton |
1979 | 22.242 | -0.224 | Million Btu per Short Ton |
1980 | 22.543 | + 0.301 | Million Btu per Short Ton |
1981 | 22.474 | -0.068999999999999 | Million Btu per Short Ton |
1982 | 22.695 | + 0.221 | Million Btu per Short Ton |
1983 | 22.775 | + 0.079999999999998 | Million Btu per Short Ton |
1984 | 22.844 | + 0.069000000000003 | Million Btu per Short Ton |
1985 | 22.646 | -0.198 | Million Btu per Short Ton |
1986 | 22.947 | + 0.301 | Million Btu per Short Ton |
1987 | 23.404 | + 0.457 | Million Btu per Short Ton |
1988 | 23.571 | + 0.167 | Million Btu per Short Ton |
1989 | 23.65 | + 0.078999999999997 | Million Btu per Short Ton |
1990 | 23.137 | -0.513 | Million Btu per Short Ton |
1991 | 23.114 | -0.023 | Million Btu per Short Ton |
1992 | 23.105 | -0.0090000000000003 | Million Btu per Short Ton |
1993 | 22.994 | -0.111 | Million Btu per Short Ton |
1994 | 23.112 | + 0.118 | Million Btu per Short Ton |
1995 | 23.118 | + 0.0060000000000002 | Million Btu per Short Ton |
1996 | 23.011 | -0.107 | Million Btu per Short Ton |
1997 | 22.494 | -0.517 | Million Btu per Short Ton |
1998 | 21.62 | -0.874 | Million Btu per Short Ton |
1999 | 23.88 | + 2.26 | Million Btu per Short Ton |
2000 | 25.02 | + 1.14 | Million Btu per Short Ton |
2001 | 24.909 | -0.111 | Million Btu per Short Ton |
2002 | 22.962 | -1.947 | Million Btu per Short Ton |
2003 | 22.242 | -0.72 | Million Btu per Short Ton |
2004 | 22.324 | + 0.082000000000001 | Million Btu per Short Ton |
2005 | 22.342 | + 0.017999999999997 | Million Btu per Short Ton |
2006 | 22.066 | -0.276 | Million Btu per Short Ton |
2007 | 22.069 | + 0.0030000000000001 | Million Btu per Short Ton |
2008 | 23.035 | + 0.966 | Million Btu per Short Ton |
2009 | 22.852 | -0.183 | Million Btu per Short Ton |
2010 | 22.611 | -0.241 | Million Btu per Short Ton |
2011 | 22.099 | -0.512 | Million Btu per Short Ton |
2012 | 21.3 | -0.799 | Million Btu per Short Ton |
2013 | 21.233 | -0.067 | Million Btu per Short Ton |
2014 | 21.307 | + 0.073999999999998 | Million Btu per Short Ton |
2015 | 20.699 | -0.608 | Million Btu per Short Ton |
2016 | 20.078 | -0.621 | Million Btu per Short Ton |
2017 | 19.467 | -0.611 | Million Btu per Short Ton |
2018 | 19.269 | -0.198 | Million Btu per Short Ton |
2019 | 19.084 | -0.185 | Million Btu per Short Ton |
2020 | 18.297 | -0.787 | Million Btu per Short Ton |
2021 | 18.297 | 0 | Million Btu per Short Ton |