Year	thousand metric tons of CO2 equivalent
1990	53.9
1991	62.3
1992	70.5
1993	85.6
1994	86.7
1995	98.3
1996	99.5
1997	103
1998	101.9
1999	103.2
2000	96.8
2001	100.2
2002	101.6
2003	103.9
2004	107.5
2005	106.8
2006	105.3
2007	94.9
2008	111.6
2009	123.3
2010	138.3
2011	114.7
2012	121.8
2013	116.8
2014	123.9
2015	130
2016	135.3
2017	139.1
2018	137.5
2019	136.5
2020	115.6