Year	thousand metric tons of CO2 equivalent
1990	4.27
1991	4.885
1992	4.9225
1993	4.77
1994	4.8475
1995	4.8475
1996	4.85
1997	4.925
1998	4.925
1999	5.0025
2000	5.0025
2001	5.0025
2002	5.1175
2003	5.1175
2004	5.1175
2005	5.1175
2006	5.1175
2007	5.1575
2008	5.2025
2009	5.2425
2010	5.2525
2011	5.275
2012	5.3
2013	5.325
2014	5.365
2015	5.405
2016	5.4225
2017	5.45
2018	5.4675
2019	5.4925
2020	5.5175