Year	sq. km
1961	96460
1962	96460
1963	96460
1964	96460
1965	96460
1966	96460
1967	96460
1968	96460
1969	96460
1970	96460
1971	96460
1972	96460
1973	96460
1974	96460
1975	96460
1976	96460
1977	96460
1978	96460
1979	96460
1980	96460
1981	96460
1982	96460
1983	96460
1984	96460
1985	96460
1986	96460
1987	96460
1988	96460
1989	96460
1990	96460
1991	96460
1992	96460
1993	96460
1994	96460
1995	96460
1996	96460
1997	96460
1998	96460
1999	96460
2000	96460
2001	96740
2002	96790
2003	96800
2004	96820
2005	96850
2006	96880
2007	96920
2008	96990
2009	97060
2010	97200
2011	97190
2012	97310
2013	97426
2014	97430
2015	97445
2016	97489
2017	97510
2018	97520
2019	97600
2020	97600
2021	97600