Year	thousand metric tons of CO2 equivalent
1990	52.9
1991	50.3
1992	32.4
1993	22.6
1994	14
1995	12.1
1996	10.3
1997	11.2
1998	10.4
1999	8.1
2000	7.4
2001	8.1
2002	8.7
2003	8.1
2004	10.2
2005	9.2
2006	10.7
2007	16.1
2008	15.8
2009	12.9
2010	13.7
2011	14.7
2012	22.5
2013	22.1
2014	35.8
2015	32.8
2016	36.4
2017	37
2018	40.3
2019	43.1
2020	51