Year	thousand metric tons of CO2 equivalent
1990	2.532455
1991	2.553212
1992	2.60377
1993	2.684127
1994	2.704884
1995	2.755441
1996	2.8069
1997	2.82856
1998	2.850219
1999	2.871879
2000	3.251138
2001	3.401775
2002	3.701411
2003	3.732847
2004	3.823884
2005	3.88512
2006	3.945116
2007	4.183911
2008	4.303507
2009	4.423102
2010	4.512898
2011	4.631215
2012	4.719732
2013	4.689049
2014	4.747766
2015	4.806483
2016	4.893909
2017	4.921735
2018	4.979362
2019	5.036988
2020	5.124415