Year	thousand metric tons of CO2 equivalent
1990	534.8
1991	524.5
1992	511.5
1993	502.5
1994	451.5
1995	787.2
1996	841.8
1997	1054.7
1998	917.6
1999	954.4
2000	652.6
2001	652.6
2002	653.1
2003	652.6
2004	652.6
2005	558.5
2006	571.5
2007	584.4
2008	597.8
2009	622.1
2010	637.8
2011	652.9
2012	674.3
2013	688.1
2014	692.2
2015	695.9
2016	698.1
2017	708.8
2018	729.4
2019	748.2
2020	777.8