Year	thousand metric tons of CO2 equivalent
1990	44.8175
1991	46.3975
1992	46.8475
1993	47.31
1994	46.5675
1995	46.725
1996	46.595
1997	46.21
1998	45.0125
1999	46.7625
2000	48.2675
2001	45.9375
2002	46.21
2003	47.21
2004	49.2675
2005	50.64
2006	51.3175
2007	51.995
2008	53.1725
2009	53.3625
2010	53.6875
2011	53.405
2012	54.3275
2013	55.255
2014	55.9825
2015	56.3375
2016	56.1925
2017	56.2975
2018	56.475
2019	56.59
2020	56.775