Year	thousand metric tons of CO2 equivalent
1990	35.5
1991	34
1992	33.7
1993	32
1994	36.1
1995	37.8
1996	43.6
1997	39.2
1998	41.1
1999	48
2000	45.1
2001	43.8
2002	48.2
2003	53.1
2004	53.3
2005	54.1
2006	53.6
2007	56.7
2008	62.2
2009	84.6
2010	79.7
2011	78.4
2012	75.5
2013	69.2
2014	64
2015	69
2016	71
2017	70.7
2018	77.1
2019	80.7
2020	84.8