Year	thousand metric tons of CO2 equivalent
1990	3190.2
1991	3208.9
1992	3365.1
1993	3522
1994	3638.1
1995	3763.8
1996	3801.2
1997	3855.3
1998	4019.8
1999	4227.2
2000	4424
2001	4722.7
2002	4878.6
2003	5112.1
2004	5352.3
2005	5585.2
2006	5995.4
2007	6244
2008	6576.4
2009	6937
2010	7337.7
2011	7368.8
2012	7607.5
2013	7991.5
2014	8131.7
2015	8618.6
2016	9054.5
2017	9132.1
2018	8708.8
2019	8719.8
2020	8856.3