Year	sq. km
1961	2410306
1962	2410306
1963	2410306
1964	2410306
1965	2410306
1966	2410306
1967	2410306
1968	2410306
1969	2410306
1970	2410306
1971	2410306
1972	2410306
1973	2410306
1974	2410276
1975	2410156
1976	2410096
1977	2410066
1978	2410056
1979	2410066
1980	2409996
1981	2409986
1982	2409986
1983	2409956
1984	2409966
1985	2409966
1986	2409966
1987	2409966
1988	2409966
1989	2409966
1990	2409966
1991	2409966
1992	2597403
1993	2645493
1994	2645483
1995	2645473
1996	2645463
1997	2645423
1998	2645393
1999	2645353
2000	2679346.46
2001	2678816.46
2002	2679296.46
2003	2679726.46
2004	2679346.46
2005	2679206.46
2006	2678576.46
2007	2678636.46
2008	2678097.66
2009	2678017.26
2010	2679328.66
2011	2679164.46
2012	2679474.16
2013	2680874.66
2014	2680862.06
2015	2680277.66
2016	2680670.06
2017	2679948.5100000002
2018	2680001.9390000002
2019	2679977.4960000003
2020	2679977.105
2021	2680151.404