Year	sq. km
1961	93910
1962	93910
1963	93910
1964	93910
1965	93910
1966	93910
1967	93910
1968	93910
1969	93910
1970	93910
1971	93910
1972	93910
1973	93910
1974	93910
1975	93910
1976	93910
1977	93910
1978	93910
1979	93910
1980	93910
1981	93910
1982	93910
1983	93910
1984	93910
1985	93910
1986	93910
1987	93910
1988	93910
1989	93910
1990	93910
1991	93910
1992	93910
1993	93540
1994	93460
1995	93390
1996	93330
1997	93060
1998	93070
1999	92810
2000	92520
2001	91280
2002	90250
2003	89860
2004	89570
2005	89490
2006	89580
2007	89160
2008	89170
2009	89270
2010	88980
2011	88750
2012	87960
2013	87112
2014	86239
2015	85742
2016	85327
2017	84940
2018	84530
2019	83870
2020	82810
2021	81740