Year	sq. km
1961	332300
1962	332320
1963	331370
1964	327530
1965	326940
1966	321560
1967	323820
1968	321590
1969	325270
1970	321190
1971	326840
1972	325680
1973	322800
1974	320780
1975	319210
1976	315160
1977	315900
1978	314780
1979	313550
1980	312380
1981	312060
1982	311910
1983	307910
1984	306280
1985	307120
1986	306100
1987	306010
1988	305780
1989	307010
1990	304720
1991	303710
1992	302790
1993	300330
1994	301830
1995	297190
1996	301390
1997	300590
1998	299580
1999	297780
2000	297660
2001	295200
2002	294190
2003	291530
2004	290710
2005	291640
2006	286130
2007	280040
2008	281420
2009	279700
2010	275450
2011	270140
2012	269420
2013	267332
2014	265780
2015	265765
2016	262657
2017	262955.3
2018	261833.23899999997
2019	262066.90600000002
2020	261426.38100000002
2021	262284.464