Year	thousand metric tons of CO2 equivalent
1990	234
1991	223.2
1992	225.6
1993	208.7
1994	247.1
1995	245.3
1996	259.5
1997	275.5
1998	278.7
1999	289.4
2000	286.1
2001	305.7
2002	318.5
2003	328.7
2004	345.7
2005	372
2006	418.5
2007	406.7
2008	425.1
2009	434.7
2010	453.2
2011	455.1
2012	450.7
2013	458.2
2014	468.2
2015	483.5
2016	511.4
2017	515.7
2018	526.2
2019	537.1
2020	521.9