Year	sq. km
1961	20070772
1962	20070772
1963	20070772
1964	20070772
1965	20070772
1966	20070772
1967	20070772
1968	20070772
1969	20070772
1970	20070772
1971	20070772
1972	20070772
1973	20070772
1974	20070772
1975	20070912
1976	20070782
1977	20070782
1978	20070782
1979	20070782
1980	20070692
1981	20070692
1982	20070692
1983	20070692
1984	20070692
1985	20070692
1986	20070692
1987	20070692
1988	20070692
1989	20070692
1990	20070692
1991	20070692
1992	20070692
1993	20070692
1994	20070692
1995	20070692
1996	20070692
1997	20070692
1998	20042212
1999	20042212
2000	20042212
2001	20042212
2002	20041202
2003	20041212
2004	20041222
2005	20041252
2006	20041242
2007	20041252
2008	20041252
2009	20041252
2010	20041252
2011	20042203
2012	20041989
2013	20039560
2014	20039140
2015	20039220
2016	20039160
2017	20038920
2018	20038980
2019	20038201
2020	20038201
2021	20038201