Year	thousand metric tons of CO2 equivalent
1990	6670.556432
1991	6413.85775
1992	5508.762937
1993	4911.623753
1994	4507.696463
1995	4411.783515
1996	4882.793615
1997	4991.328812
1998	5240.289382
1999	5232.268049
2000	5442.452168
2001	5503.534879
2002	5751.415365
2003	5847.561299
2004	6078.272481
2005	6319.861644
2006	6272.786741
2007	7058.328185
2008	6759.635264
2009	4669.816385
2010	4571.322062
2011	4911.121584
2012	4735.947132
2013	4492.820211
2014	4559.397702
2015	4571.956037
2016	4428.890997
2017	4463.234376
2018	4312.990554
2019	4487.435132
2020	4614.14431