Year	thousand metric tons of CO2 equivalent
1969	0
1970	3.12358666
1971	3.121826666
1972	3.376958836
1973	4.451523554
1974	4.61335552
1975	4.65516181
1976	4.432748218
1977	4.492085938
1978	3.813268956
1979	3.853889124
1980	7.65765968
1981	7.373527072
1982	5.346896368
1983	4.768861068
1984	4.274411192
1985	3.96515668
1986	4.56937954
1987	4.567444148
1988	4.914541042
1989	5.29702394
1990	5.59609117
1991	5.89613769
1992	6.79894573
1993	6.48699769
1994	6.284503458
1995	6.481647276
1996	7.065586464
1997	8.175313924
1998	8.575863188
1999	8.688602004
2000	7.256455076
2001	7.111176738
2002	7.218796896
2003	7.2773957
2004	6.807750908
2005	6.671743926
2006	6.325627469
2007	6.16197137
2008	5.897579221