Year	sq. km
1961	100
1962	90
1963	90
1964	90
1965	90
1966	90
1967	90
1968	90
1969	90
1970	90
1971	100
1972	90
1973	90
1974	90
1975	90
1976	90
1977	90
1978	90
1979	90
1980	90
1981	90
1982	90
1983	90
1984	90
1985	90
1986	90
1987	90
1988	90
1989	90
1990	90
1991	90
1992	90
1993	90
1994	90
1995	90
1996	90
1997	90
1998	90
1999	90
2000	90
2001	90
2002	90
2003	90
2004	90
2005	90
2006	90
2007	90
2008	90
2009	90
2010	90
2011	90
2012	90
2013	90
2014	90
2015	90
2016	90
2017	90
2018	90
2019	90
2020	90
2021	90