Year	thousand metric tons of CO2 equivalent
1990	19.915
1991	19.23
1992	19.4525
1993	19.0075
1994	18.3925
1995	17.0325
1996	18.45
1997	18.5675
1998	18.945
1999	19.785
2000	18.9525
2001	18.1575
2002	24.1275
2003	21.03
2004	19.6125
2005	19.39
2006	19.5225
2007	19.3025
2008	16.6625
2009	17.15
2010	19.7625
2011	19.7675
2012	19.87
2013	20.28
2014	20.2825
2015	21.2175
2016	23.0425
2017	24.3375
2018	25.1425
2019	25.87
2020	25.795