Year	sq. km
1961	91500
1962	91500
1963	91500
1964	91500
1965	91500
1966	91500
1967	91500
1968	91500
1969	91500
1970	91500
1971	91500
1972	91500
1973	91500
1974	91500
1975	91500
1976	91500
1977	91500
1978	91500
1979	91500
1980	91500
1981	91500
1982	91500
1983	91500
1984	91500
1985	91500
1986	91500
1987	91500
1988	91500
1989	91500
1990	91500
1991	91500
1992	91500
1993	91500
1994	91500
1995	91500
1996	91500
1997	91500
1998	91500
1999	91500
2000	91500
2001	91500
2002	91500
2003	91500
2004	91500
2005	91470
2006	91470
2007	91470
2008	91470
2009	91590
2010	91590
2011	91590
2012	91590
2013	91605.2
2014	91605.6
2015	91605.6
2016	91605.6
2017	91605.6
2018	91605.6
2019	91605.6
2020	91605.6
2021	91605.6