Year	sq. km
1961	19753851
1962	19753851
1963	19753851
1964	19753851
1965	19753851
1966	19753851
1967	19753851
1968	19753851
1969	19753851
1970	19753851
1971	19753851
1972	19753851
1973	19753851
1974	19753451
1975	19753191
1976	19753191
1977	19753191
1978	19753191
1979	19753191
1980	19753191
1981	19753191
1982	19753191
1983	19753191
1984	19753191
1985	19753191
1986	19753191
1987	19753191
1988	19753191
1989	19753191
1990	19753191
1991	19753191
1992	19753191
1993	19753191
1994	19753191
1995	19753191
1996	19753191
1997	19753191
1998	19753191
1999	19753191
2000	19753191
2001	19753191
2002	19753191
2003	19753191
2004	19901770.922
2005	19901816.092
2006	19901808.252
2007	19901854.665
2008	19901816.89
2009	19901849.284
2010	19902537.055
2011	19902820.05
2012	19394820.142
2013	19394782.325999998
2014	19394735.467
2015	19394789.128
2016	19394796.968000002
2017	19394785.053
2018	19394800.143
2019	19394812.404
2020	19394766.094
2021	19394766.094