Year	thousand metric tons of CO2 equivalent
1990	462.715
1991	474.035
1992	488.7078
1993	418.4314
1994	430.5376
1995	440.7444
1996	439.039
1997	433.6956
1998	432.346
1999	414.4038
2000	411.684
2001	371.1374
2002	389.973
2003	411.5826
2004	409.5734
2005	422.1914
2006	388.4254
2007	422.359
2008	412.6488
2009	403.6846
2010	436.5492
2011	437.8634
2012	436.501
2013	442.5354
2014	439.3262
2015	419.3828
2016	406.4396
2017	417.1298
2018	421.9978
2019	447.5226
2020	423.5448