Year	thousand metric tons of CO2 equivalent
1990	7.5096
1991	7.0328
1992	7.0328
1993	7.1222
1994	7.152
1995	7.2712
1996	7.2414
1997	7.2414
1998	7.301
1999	7.2414
2000	7.1222
2001	7.0626
2002	6.8242
2003	6.407
2004	6.3772
2005	6.4964
2006	6.556
2007	6.854
2008	6.9732
2009	7.152
2010	6.9136
2011	6.705
2012	6.2878
2013	5.8408
2014	5.7514
2015	5.7812
2016	5.5726
2017	5.7812
2018	5.662
2019	5.6918
2020	5.6918