Year	thousand metric tons of CO2 equivalent
1990	6439.673758
1991	5877.748513
1992	5410.940469
1993	4547.520824
1994	4074.947779
1995	3986.262388
1996	3971.569127
1997	4091.837466
1998	3951.983005
1999	3746.750344
2000	3713.640683
2001	3869.580619
2002	3543.692756
2003	3314.282092
2004	3411.725028
2005	3181.053765
2006	3357.105647
2007	3324.928129
2008	3325.807812
2009	3267.802894
2010	3481.429376
2011	3531.711144
2012	3519.402111
2013	3626.855679
2014	3720.033446
2015	3612.074614
2016	3541.597492
2017	3521.853769
2018	3456.768047
2019	3480.347125
2020	3195.025202