Year	thousand metric tons of CO2 equivalent
1990	0
1991	20.5
1992	21.6
1993	23
1994	24.7
1995	26.2
1996	30.3
1997	31
1998	32.1
1999	32.6
2000	32.7
2001	38
2002	34.3
2003	35.6
2004	37.1
2005	43.2
2006	39.3
2007	39.4
2008	42.3
2009	45.7
2010	46.6
2011	47
2012	46
2013	48.4
2014	50.8
2015	52.7
2016	53.1
2017	52.4
2018	52.7
2019	52.4
2020	48.6