Year	sq. km
1961	345390
1962	344400
1963	343540
1964	341090
1965	340010
1966	338460
1967	336290
1968	331780
1969	331730
1970	324950
1971	326230
1972	325150
1973	324600
1974	324420
1975	323570
1976	320210
1977	319100
1978	319610
1979	318340
1980	317220
1981	316870
1982	316460
1983	315650
1984	315080
1985	314420
1986	313950
1987	313530
1988	308300
1989	307409
1990	305928
1991	304849
1992	303843
1993	302913
1994	302049
1995	301502
1996	300963
1997	300396
1998	299800
1999	299291
2000	298074
2001	297133
2002	296107
2003	295346
2004	294584
2005	293904
2006	293127
2007	292061
2008	291101
2009	290199
2010	289263
2011	288786
2012	288448
2013	287737
2014	287665
2015	287269
2016	287180.21
2017	286974.99
2018	286601
2019	286211.86
2020	285537.54
2021	285537.54