Year	thousand metric tons of CO2 equivalent
1990	46.162251
1991	50.386649
1992	56.759951
1993	57.057512
1994	57.0075
1995	57.079137
1996	60.126044
1997	61.047161
1998	61.265278
1999	62.759532
2000	65.540402
2001	69.774962
2002	83.562181
2003	84.801066
2004	91.90322
2005	90.295906
2006	91.209228
2007	87.038266
2008	84.769929
2009	83.713403
2010	87.892311
2011	79.317165
2012	81.089918
2013	73.790938
2014	71.824487
2015	67.853696
2016	65.953311
2017	66.962132
2018	69.070953
2019	68.279774
2020	66.588594