Year	thousand metric tons of CO2 equivalent
1990	43.508
1991	43.359
1992	42.2862
1993	40.9154
1994	41.8988
1995	46.0708
1996	47.2032
1997	45.8622
1998	44.1636
1999	42.9716
2000	41.571
2001	38.4122
2002	29.4722
2003	29.7702
2004	44.3722
2005	34.3594
2006	33.4058
2007	32.8396
2008	35.6408
2009	29.4126
2010	30.0086
2011	32.1542
2012	34.8958
2013	35.4322
2014	31.9158
2015	31.3794
2016	33.1674
2017	35.76
2018	31.4092
2019	31.0814
2020	31.3794