Year	thousand metric tons of CO2 equivalent
1990	1.639
1991	1.639
1992	1.6688
1993	1.7284
1994	1.7284
1995	1.7582
1996	1.788
1997	1.788
1998	1.788
1999	1.788
2000	2.1456
2001	2.2648
2002	2.533
2003	2.533
2004	2.5926
2005	2.6224
2006	2.6522
2007	2.8608
2008	2.9502
2009	3.0396
2010	3.0992
2011	3.1886
2012	3.2482
2013	3.1886
2014	3.2184
2015	3.2482
2016	3.3078
2017	3.3078
2018	3.3376
2019	3.3674
2020	3.427