Year	thousand metric tons of CO2 equivalent
1970	1.8201278
1971	1.8263557
1972	2.0842664
1973	2.6007078
1974	2.7728477
1975	3.0069504
1976	2.8514854
1977	3.393105
1978	2.7447555
1979	2.9332789
1980	4.373294
1981	4.771582
1982	4.821554
1983	6.576836
1984	5.878995
1985	5.810299
1986	7.694634
1987	7.726161
1988	8.986218
1989	8.985536
1990	9.184587
1991	9.097973
1992	10.111022
1993	10.805701
1994	11.396437
1995	11.093071
1996	12.8526
1997	14.328603
1998	15.302809
1999	15.840907
2000	11.083182
2001	11.472232
2002	10.138736
2003	9.842469
2004	11.124846
2005	11.223984
2006	10.93463
2007	11.298694
2008	11.726215
2009	11.410914
2010	11.42319
2011	11.5374219
2012	11.6516538