Year	thousand metric tons of CO2 equivalent
1990	78.3
1991	33.5
1992	33.4
1993	36.4
1994	37
1995	36.8
1996	40.3
1997	40.3
1998	40.2
1999	40.9
2000	45.4
2001	43.4
2002	41.1
2003	40.2
2004	40.6
2005	35.7
2006	34.9
2007	32.2
2008	34.8
2009	33.6
2010	33.9
2011	34.9
2012	36.2
2013	37.2
2014	36.9
2015	39
2016	35.3
2017	34.8
2018	34.4
2019	35.7
2020	225.3