Year	thousand metric tons of CO2 equivalent
1990	357.6
1991	364.8
1992	371.1
1993	377.1
1994	381.1
1995	382.5
1996	390.1
1997	398.2
1998	403.1
1999	412.4
2000	416.8
2001	422.1
2002	426.2
2003	427.2
2004	761.5
2005	739.1
2006	701.7
2007	665.9
2008	617.4
2009	569.8
2010	560.6
2011	560.4
2012	572.3
2013	561.5
2014	558.1
2015	559.1
2016	556.8
2017	554.2
2018	548.2
2019	549.3
2020	531.6