Year	sq. km
1961	983160
1962	981790
1963	981090
1964	980490
1965	979790
1966	979140
1967	978390
1968	977690
1969	977090
1970	976350
1971	969380
1972	971500
1973	974000
1974	975510
1975	975510
1976	975510
1977	976010
1978	981980
1979	979980
1980	981800
1981	982100
1982	983150
1983	1010200
1984	1010310
1985	1012355
1986	1014410
1987	1025500
1988	1030510
1989	1040500
1990	1051510
1991	1061540
1992	1061770
1993	1061800
1994	1061900
1995	1061950
1996	1063100
1997	1063100
1998	1063250
1999	1063260
2000	1063300
2001	1065500
2002	1065500
2003	1065500
2004	1065700
2005	1065700
2006	1065700
2007	1067000
2008	1033550
2009	1026820
2010	1018070
2011	1013220
2012	1005120
2013	994860
2014	987480
2015	986800
2016	983380
2017	969460
2018	965160
2019	961060
2020	971380
2021	971260