Year	thousand metric tons of CO2 equivalent
1990	4.931302
1991	5.05137
1992	5.171437
1993	5.291505
1994	8.391572
1995	22.10044
1996	22.231314
1997	22.362189
1998	22.493064
1999	22.623938
2000	22.754813
2001	22.815144
2002	22.875475
2003	22.965606
2004	23.025936
2005	23.086267
2006	23.102564
2007	23.297662
2008	23.313959
2009	24.045456
2010	24.031954
2011	25.030434
2012	25.105114
2013	25.626794
2014	25.731275
2015	26.074155
2016	26.410988
2017	26.420022
2018	26.697256
2019	27.123489
2020	27.549723