Year	thousand metric tons of CO2 equivalent
1990	19392.9
1991	21258.6
1992	20875.1
1993	20940.1
1994	22247.7
1995	22714.4
1996	23594.8
1997	23834.5
1998	23804.4
1999	22683.2
2000	24040.2
2001	24276.7
2002	22835.5
2003	25217.6
2004	26014.8
2005	27594.2
2006	28861.7
2007	28405.3
2008	28973.2
2009	26650.9
2010	27743.4
2011	30227.8
2012	31393.2
2013	32723.6
2014	32420.6
2015	34599.4
2016	35881.2
2017	34095.1
2018	33928.3
2019	35859.4
2020	33765