Year	thousand metric tons of CO2 equivalent
1990	25.7
1991	26.7
1992	25.9
1993	26.3
1994	22.5
1995	24.1
1996	22.8
1997	21.5
1998	22.3
1999	21.4
2000	17.9
2001	20.8
2002	20.2
2003	24.6
2004	27.9
2005	29.9
2006	46.5
2007	37.6
2008	43.2
2009	47.1
2010	52.9
2011	77
2012	108.1
2013	114.4
2014	119
2015	118.7
2016	109.3
2017	87.6
2018	87.2
2019	88.3
2020	86.9