Year	sq. km
1961	185180
1962	185180
1963	185180
1964	185180
1965	185180
1966	185180
1967	185180
1968	185180
1969	185180
1970	185180
1971	185180
1972	185180
1973	185180
1974	185180
1975	185180
1976	185180
1977	185180
1978	185180
1979	185180
1980	185180
1981	185180
1982	185180
1983	185180
1984	185180
1985	185180
1986	185180
1987	185180
1988	185180
1989	185180
1990	185180
1991	185180
1992	185180
1993	185180
1994	185180
1995	185180
1996	185180
1997	185180
1998	185180
1999	185180
2000	185180
2001	185180
2002	185180
2003	185180
2004	185180
2005	185180
2006	185180
2007	185180
2008	185180
2009	185180
2010	185180
2011	185180
2012	185180
2013	185180
2014	185180
2015	185180
2016	185180
2017	185180
2018	185180
2019	185180
2020	185180
2021	185180