Year	sq. km
1961	14973680
1962	14973680
1963	14973680
1964	14973680
1965	14973680
1966	14973680
1967	14973680
1968	14973680
1969	14973680
1970	14973680
1971	14973680
1972	14973680
1973	14973680
1974	14973680
1975	14973680
1976	14973680
1977	14973680
1978	14973680
1979	14973680
1980	14973680
1981	14973680
1982	14973680
1983	14973680
1984	14973680
1985	14973680
1986	14973680
1987	14973680
1988	14973680
1989	14973680
1990	14973680
1991	14973680
1992	14973680
1993	14973680
1994	14973680
1995	14973680
1996	14973680
1997	14973680
1998	14973680
1999	14973680
2000	14973680
2001	14973680
2002	14973680
2003	14973680
2004	15009714.114
2005	15009713.169
2006	15009682.93
2007	15009650.599
2008	15009667.542
2009	15009679.862
2010	15009674.451000001
2011	15009953.029
2012	15029019.533
2013	15028987.412
2014	15028973.958
2015	15029027.541
2016	15029014.92
2017	15029009.283
2018	15029015.383000001
2019	15029019.118
2020	15028977.871
2021	15028977.871