Year	thousand metric tons of CO2 equivalent
1990	0.9
1991	0.9
1992	0.9
1993	0.9
1994	0.9
1995	1
1996	1.4
1997	2.3
1998	2.2
1999	2.8
2000	4
2001	4.5
2002	6
2003	6.8
2004	8.4
2005	9
2006	9.7
2007	10.6
2008	10.8
2009	11.4
2010	11.8
2011	12.3
2012	12.8
2013	13.4
2014	13.8
2015	13.9
2016	14.5
2017	12.7
2018	12.2
2019	12.7
2020	11