Year	thousand metric tons of CO2 equivalent
1990	23.3075
1991	23.3025
1992	23.3
1993	23.295
1994	23.225
1995	23.1725
1996	23.1025
1997	23.1
1998	23.1225
1999	23.1225
2000	19.57
2001	19.6075
2002	20.0525
2003	20.0425
2004	20.4225
2005	20.45
2006	20.3625
2007	20.61
2008	20.7475
2009	20.9625
2010	20.8425
2011	20.84
2012	20.8725
2013	20.9025
2014	21.4775
2015	21.4
2016	21.1225
2017	21.095
2018	21.0425
2019	20.7975
2020	20.5725