Year	thousand metric tons of CO2 equivalent
1990	5404.105047
1991	5086.277407
1992	4506.4156
1993	3891.1052
1994	3658.5758
1995	3505.374
1996	3736.5922
1997	3754.3828
1998	3722.6756
1999	3669.3336
2000	3667.8734
2001	3570.6956
2002	3679.9126
2003	3699.8786
2004	3726.4006
2005	3727.0264
2006	3692.6968
2007	3805.162
2008	3726.639
2009	3818.4826
2010	3804.4468
2011	3853.3188
2012	3953.268
2013	3949.9304
2014	4009.5006
2015	4085.9376
2016	3986.6738
2017	4009.143
2018	3847.925
2019	4022.1954
2020	4143.6304