Year	thousand metric tons of CO2 equivalent
1990	4021.037011
1991	3925.652866
1992	3834.633403
1993	3730.116126
1994	3688.488022
1995	3826.789413
1996	3925.183902
1997	3880.523474
1998	4029.696089
1999	3998.679836
2000	4002.437978
2001	3707.855172
2002	3721.630004
2003	3718.181222
2004	3706.674825
2005	3659.408899
2006	3623.171571
2007	3791.249598
2008	3691.780083
2009	3414.897805
2010	3362.300842
2011	3092.128853
2012	3107.369328
2013	3114.657632
2014	3248.329158
2015	3231.970075
2016	3175.29626
2017	3252.910965
2018	3123.42347
2019	3157.767575
2020	3092.139079