Year	sq. km
1961	193750
1962	193930
1963	194020
1964	194580
1965	195340
1966	195310
1967	194120
1968	192850
1969	192540
1970	190230
1971	189520
1972	189490
1973	188970
1974	188210
1975	187920
1976	187580
1977	187090
1978	186590
1979	185940
1980	185190
1981	184610
1982	183960
1983	183300
1984	182840
1985	182440
1986	182080
1987	181250
1988	180970
1989	180560
1990	180320
1991	171360
1992	169510
1993	171620
1994	173080
1995	173430
1996	173370
1997	173270
1998	173730
1999	171520
2000	170680
2001	170340
2002	169670
2003	170010
2004	170130
2005	170310
2006	169460
2007	169500
2008	169210
2009	168860
2010	167000
2011	167190
2012	166640
2013	166970
2014	167250
2015	167310
2016	166590
2017	166870
2018	166450
2019	166660
2020	165950
2021	165910