Year	thousand metric tons of CO2 equivalent
1990	47.208308
1991	47.251731
1992	48.040154
1993	47.934577
1994	47.5608
1995	46.408533
1996	46.090667
1997	45.4748
1998	44.978133
1999	45.107267
2000	45.2662
2001	45.630822
2002	45.995445
2003	46.360067
2004	46.724689
2005	47.089312
2006	47.345457
2007	47.810202
2008	48.721947
2009	48.948292
2010	48.608437
2011	48.746314
2012	49.480191
2013	49.886268
2014	49.994344
2015	50.370621
2016	51.04823
2017	51.45764
2018	51.47965
2019	51.948659
2020	52.268669