Year	thousand metric tons of CO2 equivalent
1990	26.6
1991	26.9
1992	29.9
1993	31.3
1994	32.1
1995	33.1
1996	34.2
1997	35.8
1998	38
1999	38.8
2000	41
2001	42.8
2002	46.8
2003	50.2
2004	53.5
2005	61.2
2006	65.3
2007	69.1
2008	74.3
2009	74.3
2010	76.7
2011	73.3
2012	78.9
2013	81.9
2014	85.5
2015	88.9
2016	89.7
2017	91.9
2018	95.1
2019	95.6
2020	85.5