Year	thousand metric tons of CO2 equivalent
1990	6590.1
1991	7205.1
1992	7198.8
1993	7386.6
1994	7983.8
1995	8657.6
1996	9384
1997	10104.9
1998	9996
1999	9866.5
2000	10304.8
2001	10437.9
2002	10837.9
2003	11423.9
2004	12318
2005	12712.3
2006	12377.4
2007	12491.8
2008	12979.6
2009	11935.3
2010	11742.5
2011	11408.2
2012	11827.8
2013	12824.5
2014	13435.8
2015	13742.5
2016	13525.1
2017	12985.7
2018	13072.6
2019	13012.4
2020	11910.7