Year	thousand metric tons of CO2 equivalent
1969	0
1970	0.505698908
1971	0.506417798
1972	0.53645841
1973	0.60283065
1974	0.65832871
1975	0.65554026
1976	0.6176998
1977	0.67559974
1978	0.65884145
1979	0.70740512
1980	1.32305892
1981	2.05168354
1982	2.63475975
1983	3.31140667
1984	4.06628054
1985	4.10344396
1986	6.39488956
1987	6.40793746
1988	6.72359248
1989	6.43888011
1990	6.25182859
1991	5.9831891
1992	6.49978426
1993	6.071641896
1994	4.796715746
1995	5.123704924
1996	5.35156844
1997	6.71098168
1998	6.921237382
1999	7.093087556
2000	4.034480306
2001	3.949609746
2002	3.764743974
2003	4.523984876
2004	4.590022316
2005	4.647508654
2006	4.428889338
2007	4.450087014
2008	4.420742259