Year	sq. km
1961	5093524
1962	5062713
1963	5041603
1964	5021664
1965	4994644
1966	4992514
1967	4988734
1968	4992263
1969	4987433
1970	4975613
1971	4963233
1972	4953503
1973	4942773
1974	4932623
1975	4932893
1976	4933172.9
1977	4931163
1978	4905733
1979	4901983
1980	4898233
1981	4894533
1982	4926113
1983	4925333
1984	4924553
1985	4923773
1986	4922981.92
1987	4879733
1988	4880993
1989	4882253
1990	4883513
1991	4884815.464
1992	4868943
1993	4843453
1994	4824683
1995	4814004
1996	4774984
1997	4761004
1998	4758274
1999	4751504
2000	4756864
2001	4762525.608
2002	4751554
2003	4749687
2004	4747823
2005	4745960
2006	4734832
2007	4728660
2008	4703346
2009	4678033
2010	4652720
2011	4627364
2012	4608523.538000001
2013	4614693
2014	4620862
2015	4627040
2016	4633149
2017	4636782.538000001
2018	4636998.538000001
2019	4634984.538000001
2020	4629280.538000001
2021	4628016.538000001