Year	thousand metric tons of CO2 equivalent
1990	367.8
1991	310.6
1992	346.6
1993	319.2
1994	326.1
1995	329.3
1996	366.5
1997	353.6
1998	373
1999	493.8
2000	584.2
2001	617.1
2002	675.9
2003	694.3
2004	648.7
2005	590.1
2006	642.9
2007	650.2
2008	641.4
2009	624.9
2010	622.1
2011	631.8
2012	633.4
2013	625.2
2014	651.5
2015	641.8
2016	586.1
2017	567.8
2018	556.1
2019	517.5
2020	479.5