Year	thousand metric tons of CO2 equivalent
1990	17.582
1991	17.582
1992	18.327
1993	18.178
1994	17.7608
1995	17.1052
1996	17.284
1997	17.1648
1998	17.1648
1999	17.7906
2000	18.4462
2001	18.4462
2002	18.4462
2003	18.4462
2004	18.4462
2005	18.4462
2006	18.4462
2007	18.6548
2008	19.3104
2009	19.2806
2010	18.6846
2011	18.6548
2012	19.221
2013	19.4594
2014	19.3998
2015	19.6084
2016	19.9958
2017	20.115
2018	19.8468
2019	20.0256
2020	20.0554