Year	sq. km
1961	301340
1962	301340
1963	301340
1964	301340
1965	301340
1966	301340
1967	301340
1968	301340
1969	301340
1970	301340
1971	301340
1972	301340
1973	301340
1974	301340
1975	301340
1976	301340
1977	301340
1978	301340
1979	301340
1980	301340
1981	301340
1982	301340
1983	301340
1984	301340
1985	301340
1986	301340
1987	301340
1988	301340
1989	301340
1990	301340
1991	301340
1992	301340
1993	301340
1994	301340
1995	301340
1996	301340
1997	301340
1998	301340
1999	301340
2000	302069
2001	302069
2002	302069
2003	302069
2004	302069
2005	302069
2006	302069
2007	302069
2008	302069
2009	302069
2010	302069
2011	302069
2012	302069
2013	302069
2014	302069
2015	302069
2016	302069
2017	302069
2018	302069
2019	302068
2020	302068
2021	302068