Year	sq. km
1961	377500
1962	378000
1963	378500
1964	379050
1965	379100
1966	379550
1967	379790
1968	379800
1969	379960
1970	380060
1971	380360
1972	380480
1973	380492
1974	380503
1975	380503
1976	380500
1977	380500
1978	380500
1979	380490
1980	380490
1981	380530
1982	380540
1983	380540
1984	380540
1985	380540
1986	380540
1987	380450
1988	380400
1989	380400
1990	380400
1991	380300
1992	380300
1993	379340
1994	378130
1995	377630
1996	377570
1997	377950
1998	378680
1999	377640
2000	377940
2001	377950
2002	377900
2003	378840
2004	379280
2005	379170
2006	379100
2007	379140
2008	379160
2009	379160
2010	379170
2011	379150
2012	379140
2013	379100
2014	379100
2015	379100
2016	379100
2017	379100
2018	380100
2019	380100
2020	383130
2021	383130