Year	sq. km
1961	42820
1962	42820
1963	42820
1964	42820
1965	42820
1966	42820
1967	42820
1968	42820
1969	42820
1970	42820
1971	42820
1972	42820
1973	42820
1974	42820
1975	42820
1976	42820
1977	42820
1978	42820
1979	42820
1980	42820
1981	42820
1982	42820
1983	42820
1984	42820
1985	42820
1986	42820
1987	42820
1988	42820
1989	42820
1990	42820
1991	42820
1992	42820
1993	42820
1994	42840
1995	42800
1996	42800
1997	42800
1998	42840
1999	42820
2000	42800
2001	42780
2002	36520.6
2003	36684.2
2004	36313.9
2005	36054.9
2006	35659.5
2007	35967
2008	35716.1
2009	35458.7
2010	35239.2
2011	35040.4
2012	35258.9
2013	35210
2014	35160
2015	34940
2016	34880
2017	35210
2018	35230
2019	35236.59
2020	35238.71
2021	35297.97