Year	sq. km
1961	75100
1962	75700
1963	76200
1964	76800
1965	77400
1966	78000
1967	78700
1968	79200
1969	79700
1970	79780
1971	80280
1972	80950
1973	81600
1974	82800
1975	83950
1976	85100
1977	86440
1978	86710
1979	89120
1980	89300
1981	89600
1982	90100
1983	90600
1984	91100
1985	91600
1986	92300
1987	92100
1988	92100
1989	91900
1990	91700
1991	91500
1992	91600
1993	91600
1994	91600
1995	91600
1996	91600
1997	91600
1998	91600
1999	91600
2000	91600
2001	91600
2002	91600
2003	91600
2004	92100
2005	92130
2006	92130
2007	92130
2008	92630
2009	93130
2010	97000
2011	97500
2012	97500
2013	97500
2014	97500
2015	97500
2016	97500
2017	97500
2018	97500
2019	97500
2020	97500
2021	97500