Year	thousand metric tons of CO2 equivalent
1990	0.469845
1991	927.157511
1992	1853.845177
1993	2780.532843
1994	3707.220509
1995	4633.908175
1996	4359.610034
1997	4085.311893
1998	3811.013753
1999	3536.715612
2000	3262.417472
2001	2987.8452
2002	2713.372928
2003	2438.800656
2004	2164.328384
2005	1889.656112
2006	1803.391131
2007	1717.02615
2008	1630.66117
2009	1544.296189
2010	1457.931208
2011	2261.061874
2012	3064.19254
2013	3867.323206
2014	4670.553872
2015	5473.684538
2016	5411.00106
2017	5348.317581
2018	5285.634103
2019	5222.950625
2020	5160.167146