Year	sq. km
1961	9046580
1962	9046580
1963	9046580
1964	9046580
1965	9046580
1966	9046580
1967	9046580
1968	9046580
1969	9046580
1970	9046580
1971	9046580
1972	9046580
1973	9046580
1974	9046180
1975	9045780
1976	9045780
1977	9045780
1978	9045780
1979	9045780
1980	9045780
1981	9045780
1982	9045780
1983	9045780
1984	9045780
1985	9045780
1986	9045780
1987	9045780
1988	9045780
1989	9045780
1990	9045780
1991	9045780
1992	9045780
1993	9045780
1994	9045780
1995	9045780
1996	9045780
1997	9045780
1998	9045780
1999	9045780
2000	9045780
2001	9045780
2002	9045780
2003	9045780
2004	9045780
2005	9045780
2006	9045780
2007	9045780
2008	9045780
2009	9045780
2010	9045780
2011	9045780
2012	9045780
2013	9045780
2014	9045780
2015	9045780
2016	9045780
2017	9045780
2018	9045780
2019	9045780
2020	9045773
2021	9045773