Year	thousand metric tons of CO2 equivalent
1990	3.6025
1991	3.5325
1992	3.5375
1993	3.5425
1994	3.5425
1995	3.5425
1996	3.7375
1997	3.7375
1998	3.7375
1999	3.7375
2000	4.1475
2001	4.2775
2002	4.755
2003	4.755
2004	4.835
2005	4.915
2006	4.955
2007	5.0175
2008	5.0325
2009	5.0425
2010	5.1975
2011	5.2075
2012	5.3975
2013	5.4025
2014	5.59
2015	5.6625
2016	5.735
2017	5.7775
2018	5.8075
2019	5.7775
2020	5.8325