Year	thousand metric tons of CO2 equivalent
1990	4152.232661
1991	2820.650188
1992	3495.306115
1993	4496.511042
1994	4400.663769
1995	4113.042896
1996	4017.543818
1997	4233.016139
1998	4329.80726
1999	4169.250381
2000	4239.737302
2001	5902.048553
2002	6086.449404
2003	2966.643855
2004	3300.671906
2005	3859.626357
2006	3797.524765
2007	3667.686973
2008	4040.451381
2009	4710.378188
2010	4629.448796
2011	4947.907617
2012	5200.220438
2013	5215.721658
2014	4702.260279
2015	3771.3541
2016	4129.297218
2017	4711.387136
2018	4724.945854
2019	5557.485572
2020	5439.691289