Year	thousand metric tons of CO2 equivalent
1990	0
1991	49.1
1992	49.8
1993	50.9
1994	52
1995	53.3
1996	55.6
1997	56.3
1998	56.3
1999	56.8
2000	64.2
2001	66.1
2002	64.4
2003	65.3
2004	66
2005	68.7
2006	67.1
2007	67.4
2008	68.5
2009	76.4
2010	70.9
2011	68
2012	63.7
2013	64.5
2014	65.5
2015	66.4
2016	66.6
2017	66.6
2018	66.9
2019	67
2020	65.7