Year	sq. km
1961	5677657
1962	5715237
1963	5748976
1964	5788985
1965	5823254
1966	5855292
1967	5884281
1968	5922130
1969	5947519
1970	5991908
1971	6051037
1972	6108995
1973	6157536.227
1974	6206616.455
1975	6258678.682
1976	6324112.326
1977	6390945.9690000005
1978	6449929.614
1979	6507474.258
1980	6566992.981
1981	6597285.545
1982	6623099.19
1983	6673742.833
1984	6710033.727
1985	6736615.692000001
1986	6737079.515
1987	6738156.009
1988	6735864.302999999
1989	6734452.597
1990	6757071.591
1991	6757214.765000001
1992	6743864.878
1993	6736733.173
1994	6724338.467
1995	6714429.533
1996	6721233.600000001
1997	6730103.967
1998	6743437.333
1999	6749304.700000001
2000	6743966.267000001
2001	6718759.233
2002	6725605.2
2003	6726835.067
2004	6741267.033000001
2005	6753402.4
2006	6750604.012
2007	6762027.600000001
2008	6708780.540000001
2009	6681775.590000001
2010	6696156.920000002
2011	6681118.760000001
2012	6682761.100000001
2013	6681346.950000001
2014	6641036.018
2015	6645256.114000001
2016	6619022.781
2017	6583106.755000001
2018	6573263.44
2019	6577078.306000002
2020	6605191.258000001
2021	6603895.149