Year	sq. km
1961	89100
1962	89020
1963	90210
1964	89910
1965	86780
1966	90900
1967	91130
1968	91430
1969	91440
1970	91550
1971	91550
1972	91600
1973	91430
1974	91410
1975	91180
1976	91150
1977	91120
1978	91750
1979	91810
1980	91800
1981	92060
1982	92060
1983	91820
1984	92090
1985	91840
1986	91800
1987	91770
1988	91790
1989	92150
1990	92220
1991	91640
1992	91670
1993	91600
1994	91700
1995	91640
1996	91720
1997	89850
1998	87820
1999	86700
2000	85290
2001	84380
2002	83430
2003	82520
2004	80800
2005	80050
2006	78630
2007	77530
2008	76570
2009	75600
2010	74890
2011	73960
2012	72830
2013	71530
2014	62010
2015	61990
2016	61360
2017	60535.407999999996
2018	59436.904
2019	58671.88
2020	58671.88
2021	58671.88