Year	sq. km
1961	94800
1962	94770
1963	94800
1964	95200
1965	96370
1966	96500
1967	96950
1968	96690
1969	96750
1970	96970
1971	96950
1972	99910
1973	99890
1974	99890
1975	100040
1976	99980
1977	99910
1978	99870
1979	99830
1980	99870
1981	99810
1982	99780
1983	99640
1984	100600
1985	100270
1986	100410
1987	101150
1988	104270
1989	104430
1990	103860
1991	103200
1992	95490
1993	94460
1994	93580
1995	93740
1996	93270
1997	93650
1998	94340
1999	94860
2000	94000
2001	94030
2002	93530
2003	93280
2004	93230
2005	93110
2006	92800
2007	92660
2008	92530
2009	92460
2010	92410
2011	91280
2012	91230
2013	92780
2014	93200
2015	94342.4
2016	95172.1
2017	95613.3
2018	96273
2019	98720
2020	99280
2021	100680