Year	thousand metric tons of CO2 equivalent
1990	155.5
1991	156.8
1992	158.9
1993	180.5
1994	215.6
1995	235.3
1996	251.6
1997	242.7
1998	244.5
1999	264.1
2000	271.5
2001	281
2002	290.3
2003	298.6
2004	307.5
2005	322.2
2006	323.7
2007	299.1
2008	339.3
2009	380.8
2010	423.5
2011	320.6
2012	406.8
2013	433.5
2014	461.8
2015	386.9
2016	427.5
2017	414.9
2018	410.7
2019	416
2020	411.9