Year	thousand metric tons of CO2 equivalent
1969	0
1970	18.1002222442738
1971	17.7604867825943
1972	16.9266936770399
1973	16.1125958283065
1974	15.299550213502
1975	15.7868523475325
1976	16.0467161131073
1977	16.4219572239615
1978	16.8401391403403
1979	16.9123656533627
1980	18.1987770783765
1981	22.4825709415496
1982	21.3155847070267
1983	19.5905385423898
1984	20.8844670341792
1985	23.6826674703654
1986	23.2828213077693
1987	21.33899932725
1988	21.2943331521195
1989	21.7425217977681
1990	20.1560161966351
1991	20.6600671224593
1992	21.2716865996563
1993	22.2532053677982
1994	22.6313874829847
1995	21.9472201518648
1996	21.5997928811685
1997	20.444420074808
1998	21.9547672524632
1999	22.8799169459244
2000	25.3729338382144
2001	24.512367364934
2002	23.4877172970212
2003	24.2775066517588
2004	23.1042437683414
2005	24.0566923164128
2006	24.0149986496245
2007	24.5056215163195
2008	24.7298040503713