Year	thousand metric tons of CO2 equivalent
1990	5888
1991	6565
1992	6353.9
1993	6226.2
1994	5745.2
1995	5819.6
1996	6107.8
1997	5596.9
1998	5611.9
1999	5485.2
2000	5352.4
2001	5485.3
2002	5254.4
2003	5479.4
2004	5490.5
2005	5394.1
2006	5077
2007	4952.1
2008	5140.3
2009	5126.3
2010	5537
2011	4658.2
2012	5012.1
2013	5282.2
2014	4487.6
2015	4722.2
2016	5021.3
2017	4916.5
2018	4776.2
2019	4843.2
2020	4541.2