Year	sq. km
1961	11388307.9
1962	11388307.9
1963	11388307.9
1964	11388307.9
1965	11388307.9
1966	11388307.9
1967	11388307.9
1968	11388307.9
1969	11388307.9
1970	11388307.9
1971	11388307.9
1972	11388307.9
1973	11388307.9
1974	11388307.9
1975	11388307.9
1976	11388307.9
1977	11388307.9
1978	11388307.9
1979	11388307.9
1980	11388307.9
1981	11388307.9
1982	11388307.9
1983	11388307.9
1984	11388307.9
1985	11388307.9
1986	11388307.9
1987	11388307.9
1988	11388307.9
1989	11388307.9
1990	11388307.9
1991	11388307.9
1992	11388327.9
1993	11388327.9
1994	11388327.9
1995	11388327.9
1996	11388327.9
1997	11388327.9
1998	11388327.9
1999	11388327.9
2000	11388327.9
2001	11388327.9
2002	11388327.9
2003	11388337.9
2004	11388347.9
2005	11388357.9
2006	11388357.9
2007	11388367.9
2008	11388377.9
2009	11385837.9
2010	11385839.9
2011	11385844.9
2012	11385847.9
2013	11385659.9
2014	11385540.9
2015	11385548.9
2016	11385549.9
2017	11385550.9
2018	11385550.9
2019	11385551.9
2020	11385553.9
2021	11385561.9