Year	sq. km
1961	438320
1962	438320
1963	438320
1964	438320
1965	438320
1966	438320
1967	438320
1968	438320
1969	438320
1970	438320
1971	438320
1972	438320
1973	438320
1974	438320
1975	438320
1976	438320
1977	438320
1978	438320
1979	438320
1980	438320
1981	438320
1982	438320
1983	438320
1984	438320
1985	438320
1986	438320
1987	438320
1988	438320
1989	438320
1990	438320
1991	438320
1992	438320
1993	438320
1994	438320
1995	438320
1996	438320
1997	438320
1998	438320
1999	438320
2000	438320
2001	438320
2002	438320
2003	438320
2004	438320
2005	438320
2006	438320
2007	438320
2008	438320
2009	435240
2010	435240
2011	435240
2012	435240
2013	435052
2014	435052
2015	435052
2016	435052
2017	435052
2018	435052
2019	435052
2020	435052
2021	435050