Year	sq. km
1990	4636271
1991	4635008.746
1992	4632635.192999999
1993	4630261.639
1994	4627888.085
1995	4625514.531
1996	4623140.978
1997	4620767.424
1998	4618393.87
1999	4616020.316
2000	4613646.763
2001	4632648.631999999
2002	4651650.500999999
2003	4670652.37
2004	4689654.239
2005	4708656.108
2006	4727657.977
2007	4746659.845999999
2008	4765661.715
2009	4784663.584
2010	4803665.453
2011	4809258.624000001
2012	4814851.795
2013	4820444.966
2014	4826038.138
2015	4831631.309
2016	4851971.87
2017	4852099.499999999
2018	4859767.4
2019	4867438.200000001
2020	4875109.100000001
2021	4882779.933