Year	sq. km
1961	16150900
1962	16150900
1963	16150900
1964	16150900
1965	16150900
1966	16150900
1967	16150900
1968	16150900
1969	16150900
1970	16150900
1971	16150900
1972	16150900
1973	16150900
1974	16150900
1975	16150900
1976	16150900
1977	16148780
1978	16148780
1979	16150820
1980	16150900
1981	16150900
1982	16150900
1983	16150900
1984	16150900
1985	16150900
1986	16150900
1987	16149560
1988	16149570
1989	16149570
1990	16150240
1991	16150270
1992	16150300
1993	16150320
1994	16150320
1995	16150310
1996	16150300
1997	16150300
1998	16150300
1999	16150300
2000	16148420
2001	16148424.2
2002	16148473.2
2003	16148482.7
2004	16148486.5
2005	16150383.8
2006	16150383.4
2007	16150382.8
2008	16150221.8
2009	16150222
2010	16150125
2011	16150128
2012	16150122
2013	16149727
2014	16149998
2015	16152596
2016	16152963
2017	16156107
2018	16156062.2
2019	16155893.77
2020	16155923.519
2021	16156093.77