Year	sq. km
1961	50169800.742
1962	50169800.742
1963	50169800.742
1964	50169800.742
1965	50169800.742
1966	50169800.742
1967	50169800.742
1968	50169800.742
1969	50169800.742
1970	50169800.742
1971	50169800.742
1972	50169800.742
1973	50169730.742
1974	50169690.742
1975	50169670.742
1976	50169540.742
1977	50169540.742
1978	50169540.742
1979	50169540.742
1980	50169450.742
1981	50169450.742
1982	50169450.742
1983	50169450.742
1984	50169450.742
1985	50169450.742
1986	50169450.742
1987	50169450.742
1988	50169450.742
1989	50168460.742
1990	50168460.742
1991	50169030.742
1992	70857475.742
1993	70853749.742
1994	70848925.742
1995	70845925.742
1996	70845581.742
1997	70846272.742
1998	70820271.742
1999	70827100.742
2000	70871444.742
2001	70870563.942
2002	70868842.168
2003	70875721.758
2004	70875878.519
2005	70878720.891
2006	70978961.493
2007	70978372.893
2008	70977721.887
2009	70975253.134
2010	70975600.418
2011	70975596.947
2012	70975608.94600001
2013	70974998.383
2014	70975210.921
2015	70975231.4
2016	70975251.4
2017	70969019.4
2018	70969164.3
2019	70968327.9
2020	70965228.403
2021	70980294.47