Year	sq. km
1961	1221900
1962	1221900
1963	1221900
1964	1221900
1965	1221900
1966	1221900
1967	1221900
1968	1221900
1969	1221900
1970	1221900
1971	1221900
1972	1221900
1973	1221900
1974	1221900
1975	1221900
1976	1221900
1977	1221900
1978	1221900
1979	1221900
1980	1221900
1981	1221900
1982	1221900
1983	1221900
1984	1221900
1985	1221900
1986	1221900
1987	1221900
1988	1221900
1989	1221900
1990	1221900
1991	1221900
1992	1221900
1993	1104300
1994	1104300
1995	1104300
1996	1104300
1997	1104300
1998	1104300
1999	1104300
2000	1104300
2001	1104300
2002	1104300
2003	1104300
2004	1136243.254
2005	1136243.166
2006	1136242.98
2007	1136243.922
2008	1136243.263
2009	1136243.562
2010	1136242.873
2011	1136242.41
2012	1136242.783
2013	1136243.504
2014	1136243.143
2015	1136244.136
2016	1136242.676
2017	1136243.265
2018	1136242.496
2019	1136243.012
2020	1136239.544
2021	1136239.544