Year	thousand metric tons of CO2 equivalent
1990	20604.9716
1991	19387.3138
1992	19220.106
1993	19216.1128
1994	19477.578
1995	19586.795
1996	19519.8046
1997	20165.5706
1998	19242.5156
1999	18840.156
2000	18567.9032
2001	18299.6734
2002	18586.5282
2003	18486.728
2004	18427.9922
2005	19016.8998
2006	19290.9108
2007	20049.6784
2008	19545.373
2009	19020.3268
2010	19573.2956
2011	19324.3762
2012	19686.3866
2013	19136.2488
2014	18822.8124
2015	18965.7332
2016	19705.399
2017	20163.127
2018	18833.5404
2019	19250.1742
2020	18800.4922