Year	thousand metric tons of CO2 equivalent
1990	163.6
1991	171.7
1992	156.2
1993	150.5
1994	147.1
1995	150.8
1996	150.2
1997	149.9
1998	145.8
1999	147.2
2000	229.5
2001	260.1
2002	222.4
2003	235.6
2004	227.3
2005	259.9
2006	236.9
2007	260.2
2008	258.4
2009	246.9
2010	252.5
2011	246.1
2012	238.2
2013	241.1
2014	206.4
2015	226.4
2016	230.5
2017	223.6
2018	207.9
2019	200.7
2020	189.1