Year	thousand metric tons of CO2 equivalent
1990	4579.52
1991	4385.5075
1992	4344.905
1993	4283.495
1994	4257.4725
1995	4100.9425
1996	3753.4525
1997	3785.0525
1998	3775.335
1999	3876.48
2000	3734.2475
2001	3931.6725
2002	3999.345
2003	4016.635
2004	4003.94
2005	4036.88
2006	4036.125
2007	4031.0025
2008	3971.7275
2009	3986.0975
2010	3988.8775
2011	4015.965
2012	4021.5675
2013	3904.7
2014	3789.23
2015	3538.3175
2016	3572.455
2017	3602.3625
2018	3578.8325
2019	3561.9175
2020	3579.495