Year	sq. km
1961	8771940
1962	8771940
1963	8771940
1964	8771940
1965	8771940
1966	8771940
1967	8771940
1968	8771940
1969	8771940
1970	8771940
1971	8771940
1972	8771940
1973	8771940
1974	8771940
1975	8771940
1976	8771940
1977	8771940
1978	8771940
1979	8771940
1980	8771940
1981	8771940
1982	8771940
1983	8771940
1984	8771940
1985	8771940
1986	8771940
1987	8771940
1988	8771940
1989	8771940
1990	8771940
1991	8771940
1992	8771940
1993	8771940
1994	8771940
1995	8771940
1996	8771940
1997	8771940
1998	8771940
1999	8771940
2000	8771940
2001	8771940
2002	8771940
2003	8771940
2004	8771940
2005	8771940
2006	8771940
2007	8771940
2008	8771940
2009	8769400
2010	8769400
2011	8769400
2012	8769400
2013	8769212
2014	8769212
2015	8769213
2016	8769213
2017	8769213
2018	8769213
2019	8769211
2020	8769211
2021	8769209