Year	sq. km
1961	62710
1962	62710
1963	62710
1964	62710
1965	62710
1966	62710
1967	62710
1968	62710
1969	62710
1970	62710
1971	62710
1972	62710
1973	62710
1974	62710
1975	62710
1976	62710
1977	62710
1978	62710
1979	62710
1980	62710
1981	62710
1982	62710
1983	62710
1984	62710
1985	62710
1986	62710
1987	62710
1988	62710
1989	62710
1990	62710
1991	62710
1992	62710
1993	62710
1994	62710
1995	62710
1996	62710
1997	62710
1998	62710
1999	62710
2000	62710
2001	62710
2002	62710
2003	62710
2004	62710
2005	62710
2006	62710
2007	62710
2008	62710
2009	62710
2010	62710
2011	62710
2012	62710
2013	62710
2014	62710
2015	61893
2016	61893
2017	61893
2018	61864
2019	61864.47
2020	61860
2021	61860