Year	kt of CO2 equivalent
1970	3.36314
1971	3.41448
1972	3.42077
1973	3.5062
1974	3.5324
1975	3.61845
1976	3.63696
1977	3.70498
1978	3.75944
1979	3.8752
1980	3.94072
1981	3.97787
1982	4.02762
1983	4.05508
1984	4.09401
1985	4.18417
1986	4.24877
1987	4.30727
1988	4.71477
1989	4.78627
1990	4.88389
1991	5.02328
1992	5.25167
1993	5.31216
1994	5.43133
1995	5.47264
1996	5.51471
1997	5.58602
1998	5.659
1999	5.72702
2000	5.7897
2001	5.82586
2002	5.83843
2003	5.87704
2004	5.872
2005	5.87459
2006	5.96599
2007	6.09866
2008	6.17776
2009	6.31274
2010	6.47457
2011	6.5393157
2012	6.6040614