Year	thousand metric tons of CO2 equivalent
1990	29.385
1991	30.1075
1992	30.1175
1993	30.485
1994	30.9425
1995	31.0675
1996	29.9475
1997	29.715
1998	29.3625
1999	29.4675
2000	29.1025
2001	29.925
2002	30.3925
2003	30.8225
2004	31.445
2005	31.4475
2006	31.585
2007	31.285
2008	31.2075
2009	31.0325
2010	15.0175
2011	15.1425
2012	15.1425
2013	15.095
2014	15.1375
2015	15.1525
2016	15.0875
2017	15.1425
2018	14.84
2019	13.7175
2020	13.365