Year	thousand metric tons of CO2 equivalent
1990	21653.40901
1991	20447.75172
1992	16313.87802
1993	15998.32281
1994	15286.57441
1995	15234.30421
1996	15271.57281
1997	15327.77601
1998	15254.18161
1999	15260.27601
2000	15049.40161
2001	15055.76501
2002	14709.43981
2003	14951.05241
2004	15171.27741
2005	15535.35841
2006	16021.53561
2007	15871.93421
2008	16397.01881
2009	16535.68061
2010	16432.19841
2011	16929.01721
2012	16794.52221
2013	16552.38401
2014	16135.25681
2015	16010.39941
2016	15224.11069
2017	15631.9392
2018	15497.9487
2019	15522.33821
2020	15902.54152