Year	sq. km
1961	454710
1962	449000
1963	445100
1964	441640
1965	441670
1966	441670
1967	442510
1968	442030
1969	442030
1970	442160
1971	454330
1972	453960
1973	443040
1974	443360
1975	437530
1976	440210
1977	438320
1978	438430
1979	438200
1980	438300
1981	391710
1982	391070
1983	392820
1984	396100
1985	390510
1986	386880
1987	387790
1988	388170
1989	387600
1990	386760
1991	386220
1992	388650
1993	388620
1994	396400
1995	396490
1996	396360
1997	396900
1998	398260
1999	397310
2000	400210
2001	401090
2002	398550
2003	399057
2004	411450
2005	412110
2006	411810
2007	412520
2008	413090
2009	413800
2010	413740
2011	413880
2012	413981.9
2013	414316.35
2014	414310
2015	414564
2016	413602
2017	413351.408
2018	413388.49600000004
2019	413160.71
2020	413160.71
2021	413160.71