Year	sq. km
1961	437370
1962	437370
1963	437370
1964	437370
1965	437370
1966	437370
1967	437370
1968	437370
1969	437370
1970	437370
1971	437370
1972	437370
1973	437370
1974	437370
1975	437370
1976	437370
1977	437370
1978	437370
1979	437370
1980	437370
1981	437370
1982	437370
1983	437370
1984	437370
1985	437370
1986	437370
1987	437370
1988	437370
1989	437370
1990	437370
1991	437370
1992	437370
1993	437370
1994	437370
1995	437370
1996	437370
1997	437370
1998	437370
1999	437370
2000	437370
2001	437370
2002	437370
2003	437370
2004	437370
2005	437370
2006	437370
2007	437370
2008	437370
2009	434320
2010	434320
2011	434320
2012	434320
2013	434128
2014	434128
2015	434128
2016	434128
2017	434128
2018	434128
2019	434128
2020	434128
2021	434128