Year	sq. km
1961	16271420
1962	16271420
1963	16271420
1964	16271420
1965	16271420
1966	16271420
1967	16271420
1968	16271420
1969	16271420
1970	16271420
1971	16271420
1972	16271420
1973	16271420
1974	16271420
1975	16271420
1976	16271420
1977	16269300
1978	16269300
1979	16271340
1980	16271420
1981	16271420
1982	16271420
1983	16271420
1984	16271420
1985	16271420
1986	16271420
1987	16270080
1988	16270090
1989	16270090
1990	16270760
1991	16270790
1992	16270820
1993	16270840
1994	16270840
1995	16270830
1996	16270820
1997	16270820
1998	16270820
1999	16270820
2000	16268940
2001	16268944.2
2002	16268993.2
2003	16269002.7
2004	16269006.5
2005	16270903.8
2006	16270903.4
2007	16270902.8
2008	16270741.8
2009	16270742
2010	16270645
2011	16270648
2012	16270642
2013	16270247
2014	16270518
2015	16273116
2016	16273483
2017	16276627
2018	16276582.2
2019	16276413.77
2020	16276443.519
2021	16276613.77