Year	sq. km
1961	298260
1962	298260
1963	298260
1964	298260
1965	298260
1966	298260
1967	298260
1968	298260
1969	298260
1970	298260
1971	298260
1972	298260
1973	298230
1974	298190
1975	298170
1976	298170
1977	298170
1978	298170
1979	298170
1980	298170
1981	298170
1982	298170
1983	298170
1984	298170
1985	298170
1986	298170
1987	298170
1988	298170
1989	298170
1990	298170
1991	298170
1992	298170
1993	298170
1994	298170
1995	298170
1996	298170
1997	298170
1998	298170
1999	298170
2000	298170
2001	298170
2002	298170
2003	298170
2004	298170
2005	298170
2006	298170
2007	298170
2008	298170
2009	298170
2010	298170
2011	298170
2012	298170
2013	298170
2014	298170
2015	298170
2016	298170
2017	298170
2018	298170
2019	298170
2020	298170
2021	298170