Year	thousand metric tons of CO2 equivalent
1990	139.6
1991	113.3
1992	122.5
1993	89.9
1994	63.3
1995	54.6
1996	49.2
1997	44.4
1998	37.9
1999	25.7
2000	23.7
2001	25
2002	33.8
2003	35.2
2004	36.9
2005	40.1
2006	42.3
2007	42.8
2008	47.1
2009	41.9
2010	67.1
2011	70.2
2012	67.7
2013	67.9
2014	67.7
2015	72.6
2016	78.6
2017	81.5
2018	82.2
2019	77.4
2020	74.2