Year	thousand metric tons of CO2 equivalent
1990	433941.5375
1991	437563.5325
1992	440170.525
1993	443695.81
1994	446374.6375
1995	448123.28
1996	451525.4625
1997	452398.9175
1998	456386.3
1999	457738.3775
2000	456448.6625
2001	458377.63
2002	449350.83
2003	454749.745
2004	459042.05
2005	470027.53
2006	476481.565
2007	485855.525
2008	490363.7975
2009	481092.96
2010	484134.6775
2011	487576.7225
2012	484399.915
2013	487513.935
2014	487659.17
2015	489136.2725
2016	492331.6275
2017	496256.265
2018	500060.3875
2019	498513.4025
2020	502192.285