Year	sq. km
1961	39528
1962	39528
1963	39528
1964	39528
1965	39528
1966	39528
1967	39528
1968	39528
1969	39528
1970	39528
1971	39528
1972	39528
1973	39528
1974	39528
1975	39528
1976	39528
1977	39528
1978	39528
1979	39528.71
1980	39528.71
1981	39528.71
1982	39528.71
1983	39528.71
1984	39528.79
1985	39528.87
1986	39528.95
1987	39529.03
1988	39529.11
1989	39529.19
1990	39529.27
1991	39529.35
1992	39529.43
1993	39529.51
1994	39529.59
1995	39529.67
1996	39528.454
1997	39527.237
1998	39526.019
1999	39524.8
2000	39523.581
2001	39522.36
2002	39521.138999999996
2003	39519.917
2004	39518.693999999996
2005	39517.47
2006	39516.245
2007	39515.02
2008	39514.422
2009	39513.824
2010	39513.225
2011	39512.626000000004
2012	39512.028
2013	39511.428
2014	39510.829
2015	39510.23
2016	39509.63
2017	39509.63
2018	39509.63
2019	39509.63
2020	39509.63
2021	39509.63