Year	sq. km
1961	200
1962	200
1963	200
1964	200
1965	200
1966	200
1967	200
1968	200
1969	180
1970	150
1971	150
1972	150
1973	150
1974	150
1975	150
1976	150
1977	150
1978	150
1979	150
1980	150
1981	150
1982	140
1983	140
1984	130
1985	130
1986	120
1987	120
1988	120
1989	120
1990	120
1991	120
1992	120
1993	120
1994	100
1995	100
1996	90
1997	90
1998	90
1999	100
2000	95
2001	93
2002	81
2003	81
2004	80.3
2005	50
2006	50.1
2007	50.9
2008	51
2009	55
2010	57
2011	60
2012	60
2013	60
2014	60
2015	60
2016	60
2017	60
2018	60
2019	60
2020	60
2021	60