Year	sq. km
1961	20109964
1962	20109964
1963	20109964
1964	20109964
1965	20109964
1966	20109964
1967	20109964
1968	20109964
1969	20109964
1970	20109964
1971	20109964
1972	20109964
1973	20109964
1974	20109564
1975	20109304
1976	20109304
1977	20109304
1978	20109304
1979	20109304
1980	20109304
1981	20109304
1982	20109304
1983	20109304
1984	20109304
1985	20109304
1986	20109304
1987	20109304
1988	20109304
1989	20109304
1990	20109304
1991	20110184
1992	20441944
1993	20441944
1994	20435021
1995	20435021
1996	20435021
1997	20435021
1998	20435021
1999	20435021
2000	20435371
2001	20435371
2002	20435371
2003	20435181
2004	20581937.922
2005	20581923.092
2006	20582085.252
2007	20582191.665
2008	20581943.89
2009	20581966.284
2010	20582604.055
2011	20582917.05
2012	20706707.141999997
2013	20706599.325999998
2014	20705378.467
2015	20704619.128
2016	20704353.968000002
2017	20704262.053
2018	20704194.143
2019	20704206.873999998
2020	20704126.094
2021	20704126.094