Year	thousand metric tons of CO2 equivalent
1969	0
1970	74.26955448
1971	74.02637994
1972	70.685983341
1973	73.963202932
1974	68.336386763
1975	70.441471058
1976	69.789815098
1977	69.647543853
1978	74.40211544
1979	73.11951059
1980	68.98334148
1981	69.94327849
1982	67.09456542
1983	82.299729008
1984	81.248512746
1985	83.49591894
1986	83.386861095
1987	92.002613378
1988	94.110727892
1989	83.682438717
1990	83.460615148
1991	79.9936431
1992	80.388862255
1993	77.39281843
1994	73.863676998
1995	72.426433298
1996	72.440717385
1997	72.206659666
1998	72.045667428
1999	72.263938769
2000	72.681652485
2001	72.373394747
2002	73.341658171
2003	73.74549886
2004	73.7927999
2005	75.6270079
2006	76.475033329
2007	77.843893509
2008	78.950965509