Year	thousand metric tons of CO2 equivalent
1990	58.820562
1991	59.912234
1992	61.798692
1993	64.850877
1994	65.885318
1995	68.116547
1996	58.82057
1997	63.247024
1998	65.978428
1999	59.559826
2000	58.700552
2001	62.178937
2002	55.791336
2003	57.874323
2004	56.929009
2005	59.086319
2006	62.841396
2007	63.543641
2008	62.822511
2009	56.498388
2010	56.871516
2011	49.273672
2012	49.477021
2013	48.732426
2014	49.40851
2015	48.71639
2016	48.218071
2017	47.531951
2018	48.145832
2019	49.076912
2020	47.972192