Year	sq. km
1961	105400
1962	105400
1963	105420
1964	105430
1965	105430
1966	105430
1967	105430
1968	105430
1969	105440
1970	105480
1971	105480
1972	105500
1973	105540
1974	105580
1975	105620
1976	105680
1977	105650
1978	105200
1979	105220
1980	105250
1981	105280
1982	105540
1983	105580
1984	105620
1985	105680
1986	105650
1987	105400
1988	105420
1989	105440
1990	105210
1991	105230
1992	105250
1993	105300
1994	105180
1995	105200
1996	105220
1997	105360
1998	105380
1999	105440
2000	105400
2001	105400
2002	105400
2003	105400
2004	105450
2005	105470
2006	105500
2007	105500
2008	105500
2009	105630
2010	105760
2011	105960
2012	106020
2013	106270
2014	106270
2015	106270
2016	106270
2017	106280
2018	106310
2019	106330
2020	106390
2021	106780