Year	sq. km
1961	435080
1962	435080
1963	435080
1964	435080
1965	435080
1966	435080
1967	435080
1968	435080
1969	435080
1970	435080
1971	435080
1972	435080
1973	435080
1974	435080
1975	435080
1976	435080
1977	435080
1978	435080
1979	435080
1980	434990
1981	434990
1982	434990
1983	434990
1984	434990
1985	434990
1986	434990
1987	434990
1988	434990
1989	434990
1990	434990
1991	434990
1992	434990
1993	434990
1994	434990
1995	434990
1996	434990
1997	434990
1998	434990
1999	434990
2000	434990
2001	434990
2002	434990
2003	434990
2004	434990
2005	434990
2006	434990
2007	434990
2008	434990
2009	434990
2010	434990
2011	434990
2012	434990
2013	434990
2014	434990
2015	434990
2016	434990
2017	434990
2018	434990
2019	434990
2020	434990
2021	434990