Year	sq. km
1961	2610
1962	2610
1963	2610
1964	2620
1965	2620
1966	2620
1967	2620
1968	2630
1969	2630
1970	2630
1971	2630
1972	2640
1973	2640
1974	2640
1975	2640
1976	2650
1977	2650
1978	2650
1979	2650
1980	2650
1981	2650
1982	2720
1983	2800
1984	2900
1985	2780
1986	2670
1987	2560
1988	2460
1989	2360
1990	2320
1991	2290
1992	2300
1993	2300
1994	2310
1995	2330
1996	2350
1997	2380
1998	2400
1999	2430
2000	2450
2001	2480
2002	2500
2003	2436
2004	2366
2005	2301
2006	2246
2007	2181
2008	2106
2009	2056
2010	1986
2011	1903
2012	1840.34
2013	1837.3
2014	1837.3
2015	1840.3
2016	1840.3
2017	1840.3
2018	1840.3
2019	1840.3
2020	1840.3
2021	1840.3