Year	sq. km
1961	40000
1962	40000
1963	40000
1964	40000
1965	40000
1966	40000
1967	40000
1968	40000
1969	40000
1970	40000
1971	40000
1972	40000
1973	40000
1974	40000
1975	40000
1976	40000
1977	40000
1978	40000
1979	40000
1980	40000
1981	40000
1982	40000
1983	40000
1984	40000
1985	40000
1986	40000
1987	40000
1988	40000
1989	40000
1990	40000
1991	40000
1992	40000
1993	40000
1994	40000
1995	40000
1996	40000
1997	40000
1998	40000
1999	40000
2000	40000
2001	40000
2002	40000
2003	40000
2004	40000
2005	40000
2006	40000
2007	40000
2008	40000
2009	40000
2010	40000
2011	40000
2012	40000
2013	40000
2014	40000
2015	40000
2016	40000
2017	40000
2018	40000
2019	40000
2020	40000
2021	40000