Year	thousand metric tons of CO2 equivalent
1990	18.934066
1991	18.649986
1992	19.349306
1993	18.677826
1994	17.589146
1995	22.520067
1996	26.301261
1997	23.258256
1998	31.092251
1999	24.860645
2000	21.13224
2001	21.981383
2002	21.161726
2003	18.792469
2004	32.574812
2005	24.454155
2006	22.81809
2007	23.953424
2008	31.018958
2009	24.346692
2010	20.982227
2011	31.31221
2012	27.159393
2013	32.721376
2014	25.886559
2015	28.885742
2016	33.269707
2017	39.054272
2018	34.110837
2019	34.561201
2020	33.819566