Year	sq. km
1961	35163999.7
1962	35163979.7
1963	35163989.7
1964	35163989.7
1965	35163979.7
1966	35163969.7
1967	35163959.7
1968	35163949.7
1969	35163949.7
1970	35163939.7
1971	35163929.7
1972	35163829.7
1973	35163829.7
1974	35163799.7
1975	35163579.7
1976	35163499.7
1977	35163379.7
1978	35163379.7
1979	35163340.41
1980	35163160.41
1981	35163240.41
1982	35163030.41
1983	35162990.41
1984	35161500.489999995
1985	35161400.56999999
1986	35161500.65
1987	35161400.730000004
1988	35161390.81
1989	35161390.89
1990	35161390.97
1991	35161391.05
1992	35348828.129999995
1993	35474178.20999999
1994	35474168.29
1995	35474158.370000005
1996	35474047.154
1997	35473945.937
1998	35473914.719
1999	35473873.5
2000	35510645.741
2001	35510394.519999996
2002	35510923.298999995
2003	35511312.077
2004	35511030.854
2005	35510909.629999995
2006	35510288.405
2007	35510387.18
2008	35495387.782
2009	35496276.784
2010	35497717.585
2011	35497492.786
2012	35497911.888
2013	35499286.747999996
2014	35499972.589
2015	35499446.230000004
2016	35509557.06
2017	35508833.78
2018	35509442.20900001
2019	35509392.216000006
2020	35508595.797000006
2021	35331823.404