Year	sq. km
1961	447400
1962	447400
1963	447400
1964	447400
1965	447400
1966	447400
1967	447400
1968	447400
1969	447400
1970	447400
1971	447400
1972	447400
1973	447400
1974	447400
1975	447400
1976	447400
1977	447400
1978	447400
1979	447400
1980	447400
1981	447400
1982	447400
1983	447400
1984	447400
1985	447400
1986	447400
1987	447400
1988	447400
1989	447400
1990	447400
1991	447400
1992	447400
1993	447400
1994	447400
1995	447400
1996	447400
1997	447400
1998	447400
1999	447400
2000	444103
2001	444103
2002	444103
2003	444103
2004	444103
2005	444103
2006	444103
2007	444103
2008	444103
2009	444103
2010	444103
2011	444103
2012	444103
2013	444103
2014	444103
2015	448924
2016	448924
2017	448924
2018	448924
2019	448924
2020	448924
2021	448924