Year	sq. km
1961	9145806.6
1962	9148006.6
1963	9156486.6
1964	9157106.6
1965	9158906.6
1966	9164036.6
1967	9166376.6
1968	9181916.6
1969	9191536.6
1970	9194726.6
1971	9212756.6
1972	9220266.6
1973	9224046.6
1974	9222266.6
1975	9234166.6
1976	9241666.6
1977	9246346.6
1978	9263466.6
1979	9268336.6
1980	9278466.6
1981	9290356.6
1982	9299906.6
1983	9313516.6
1984	9321986.6
1985	9372576.6
1986	9419986.6
1987	9444046.6
1988	9493576.6
1989	9526086.6
1990	9545736.5
1991	9576188.52
1992	9627839.142
1993	9504731.444
1994	9568503.862
1995	9632664.372000001
1996	9671137.538
1997	9711413.2
1998	9735277.083
1999	9783876.534
2000	9816716.063000001
2001	9853149.037999999
2002	9877402.818
2003	9937168.871000001
2004	9953778.378999999
2005	10035483.125
2006	10062672.927000001
2007	10102570.429
2008	10131175.725000001
2009	10182308.964
2010	10222807.459
2011	10261673.688000001
2012	10318958.091
2013	10364663.109
2014	10391971.296
2015	10420903.037
2016	10444979.734000001
2017	10468324.932000002
2018	10500961.334
2019	10518122.323
2020	10532013.18
2021	10542610.780000001