Year	thousand metric tons of CO2 equivalent
1990	14.2
1991	15.1
1992	16.4
1993	17.1
1994	18.1
1995	19.3
1996	20.6
1997	21.7
1998	20.1
1999	19.8
2000	19.7
2001	20.2
2002	21
2003	22.1
2004	22.9
2005	22.3
2006	25
2007	26.7
2008	27.6
2009	27.9
2010	28.4
2011	30.4
2012	31.9
2013	31.6
2014	32.2
2015	32
2016	32
2017	32.1
2018	32.8
2019	34.5
2020	41.3