Year	thousand metric tons of CO2 equivalent
1990	43.9
1991	36.2
1992	29.9
1993	30.4
1994	32.4
1995	31.5
1996	30.9
1997	27.2
1998	30.8
1999	50.7
2000	50.8
2001	51.6
2002	55.7
2003	55.6
2004	60.3
2005	61
2006	54.6
2007	57.3
2008	60.9
2009	53.4
2010	53
2011	55.2
2012	51.5
2013	54.1
2014	60
2015	60.7
2016	67.4
2017	67.9
2018	74.8
2019	74.2
2020	60.2