Year	thousand metric tons of CO2 equivalent
1990	38222.4
1991	39828.4
1992	39692.1
1993	40338.4
1994	40812
1995	40548
1996	42928.5
1997	45890.7
1998	46157.2
1999	45223.5
2000	46562.6
2001	47107.8
2002	47994.8
2003	51896.4
2004	52746.4
2005	52503.5
2006	52761.5
2007	51193.5
2008	49644.2
2009	47094.3
2010	46837.6
2011	46686.4
2012	47835.5
2013	47417.5
2014	46338.8
2015	43228.2
2016	41761
2017	37781.3
2018	37231.4
2019	36182.4
2020	35653.5