Year	thousand metric tons of CO2 equivalent
1990	54.1
1991	50.3
1992	51.8
1993	53.1
1994	53.7
1995	58.5
1996	64
1997	66.6
1998	68.6
1999	70.6
2000	71.2
2001	68.6
2002	73.2
2003	73.4
2004	73.5
2005	73.5
2006	76.6
2007	75.6
2008	68.4
2009	62.7
2010	59.8
2011	61
2012	58.9
2013	62
2014	62.5
2015	61.4
2016	66.3
2017	65.4
2018	72.9
2019	76.7
2020	50.9