Year	thousand metric tons of CO2 equivalent
1990	3293.1
1991	3909.7
1992	3997
1993	4838
1994	5434.8
1995	5615.5
1996	6356.6
1997	8950.2
1998	9297.8
1999	9888.2
2000	11108.2
2001	10811.6
2002	10903.6
2003	12471.2
2004	14021.7
2005	14257.8
2006	15401.5
2007	16902.9
2008	19147.5
2009	20133.4
2010	24118.1
2011	27341.7
2012	29252.7
2013	30040.4
2014	29077.8
2015	28864.6
2016	29268.1
2017	29149.2
2018	29157.5
2019	28979.5
2020	28913.7