Year	sq. km
1961	399700
1962	409720
1963	414930
1964	419950
1965	430080
1966	430200
1967	430230
1968	430250
1969	430300
1970	430300
1971	450540
1972	450680
1973	450840
1974	450990
1975	451150
1976	451300
1977	453150
1978	452610
1979	452770
1980	452920
1981	453080
1982	453230
1983	453390
1984	453560
1985	453750
1986	453950
1987	454010
1988	452830
1989	451830
1990	450830
1991	448840
1992	449830
1993	449030
1994	448650
1995	445130
1996	449200
1997	450820
1998	455430
1999	456680
2000	448590
2001	417450
2002	416070
2003	420510
2004	423910
2005	425570
2006	421740
2007	424360
2008	426140
2009	425400
2010	425030
2011	417210
2012	426176
2013	448156
2014	448000
2015	447844
2016	447688
2017	434870
2018	440480
2019	443540
2020	440522.78
2021	427180