Year	sq. km
1961	2830
1962	2830
1963	2830
1964	2830
1965	2830
1966	2830
1967	2830
1968	2830
1969	2830
1970	2830
1971	2830
1972	2830
1973	2830
1974	2830
1975	2830
1976	2830
1977	2830
1978	2830
1979	2830
1980	2830
1981	2830
1982	2830
1983	2830
1984	2830
1985	2830
1986	2830
1987	2830
1988	2830
1989	2830
1990	2830
1991	2830
1992	2830
1993	2830
1994	2830
1995	2830
1996	2830
1997	2830
1998	2830
1999	2830
2000	2830
2001	2830
2002	2830
2003	2830
2004	2830
2005	2830
2006	2830
2007	2830
2008	2830
2009	2830
2010	2830
2011	2830
2012	2830
2013	2830
2014	2830
2015	2830
2016	2830
2017	2780
2018	2780
2019	2780
2020	2780
2021	2780