Year	thousand metric tons of CO2 equivalent
1990	48.2
1991	47.9
1992	57
1993	78.1
1994	60.7
1995	59.5
1996	75.5
1997	77.7
1998	63.5
1999	62
2000	59.5
2001	56.9
2002	53.7
2003	57.9
2004	56.4
2005	59.5
2006	59
2007	61.5
2008	62.1
2009	61.1
2010	60.7
2011	66.3
2012	64
2013	62
2014	61.4
2015	61.3
2016	61.3
2017	65.7
2018	62
2019	68.4
2020	58.6