Year	sq. km
1961	18124604
1962	18124604
1963	18124604
1964	18124604
1965	18124604
1966	18124604
1967	18124604
1968	18124604
1969	18124604
1970	18124604
1971	18124604
1972	18124604
1973	18124604
1974	18124604
1975	18124604
1976	18124604
1977	18124604
1978	18124604
1979	18124604
1980	18124604
1981	18124604
1982	18124604
1983	18124604
1984	18124604
1985	18124604
1986	18124604
1987	18124604
1988	18124604
1989	18124604
1990	18124604
1991	18124604
1992	18124604
1993	18124604
1994	18124604
1995	18124604
1996	18124604
1997	18124604
1998	18124604
1999	18124604
2000	18127564
2001	18127564
2002	18127564
2003	18127564
2004	18127564
2005	18127564
2006	18127564
2007	18127564
2008	18113064
2009	18113064
2010	18113064
2011	18113064
2012	18113064
2013	18113064
2014	18113064
2015	18113064
2016	18113064
2017	18113064
2018	18113064
2019	18113064
2020	18113064
2021	17936174