Year	sq. km
1961	5270
1962	5270
1963	5270
1964	5270
1965	5270
1966	5270
1967	5270
1968	5270
1969	5270
1970	5270
1971	5270
1972	5270
1973	5270
1974	5270
1975	5270
1976	5270
1977	5270
1978	5270
1979	5270
1980	5270
1981	5270
1982	5270
1983	5270
1984	5270
1985	5270
1986	5270
1987	5270
1988	5270
1989	5270
1990	5270
1991	5270
1992	5270
1993	5270
1994	5270
1995	5270
1996	5270
1997	5270
1998	5270
1999	5270
2000	5270
2001	5270
2002	5270
2003	5270
2004	5270
2005	5270
2006	5270
2007	5270
2008	5270
2009	5270
2010	5270
2011	5270
2012	5270
2013	5270
2014	5270
2015	5270
2016	5270
2017	5270
2018	5270
2019	5270
2020	5270
2021	5270