Year	sq. km
1990	6398280.269
1991	6395610.222
1992	6391492.775
1993	6387375.327999999
1994	6383257.88
1995	6379140.432999999
1996	6375022.987000001
1997	6370905.538999999
1998	6366788.092
1999	6362670.643999999
2000	6358553.197999999
2001	6375269.613
2002	6391986.029
2003	6408702.445000001
2004	6425418.861
2005	6442135.277
2006	6458851.692999999
2007	6475568.109000001
2008	6492284.525
2009	6509000.941000001
2010	6525717.357
2011	6538256.81
2012	6550796.262999999
2013	6563335.716
2014	6575875.17
2015	6588414.623
2016	6617999.125
2017	6617836.699999998
2018	6625321.5
2019	6632992.900000002
2020	6640831.400000001
2021	6648558.500000001