Year	thousand metric tons of CO2 equivalent
1990	7003.6
1991	5988.7
1992	5411.6
1993	5256.4
1994	4849.3
1995	4941.2
1996	5236.4
1997	5010.7
1998	4683.2
1999	4483.8
2000	4411.8
2001	4164
2002	4284.6
2003	4448.1
2004	4343.9
2005	4333.9
2006	4226
2007	3973.8
2008	4078.5
2009	3880.1
2010	3826.9
2011	3740.5
2012	3750
2013	3637.6
2014	3664.6
2015	3588.2
2016	3410.2
2017	3533.6
2018	3533.9
2019	3470.7
2020	3359.7