Year	kt of CO2 equivalent
1970	75.0005781
1980	101.33741
1981	91.5696294
1982	101.9960503
1983	92.6998286
1984	89.7441365
1985	95.975951
1986	125.096615
1987	124.55158
1988	155.576061
1989	146.733922
1990	159.451771
1991	219.415677
1992	257.86306
1993	261.326759
1994	305.461607
1995	302.597532
1996	305.73852
1997	318.425797
1998	334.254696
1999	346.940241
2000	356.180185
2001	362.311355
2002	368.847075
2003	384.493309
2004	387.802926
2007	426.49841
2011	459.115654966115
2012	473.005729316361