Year	sq. km
1961	15106741
1962	15106741
1963	15106741
1964	15106741
1965	15106741
1966	15106741
1967	15106741
1968	15106741
1969	15106741
1970	15106741
1971	15106741
1972	15106741
1973	15106741
1974	15106741
1975	15106741
1976	15106741
1977	15106741
1978	15106741
1979	15106741
1980	15106741
1981	15106741
1982	15106741
1983	15106741
1984	15106741
1985	15106741
1986	15106741
1987	15106741
1988	15106741
1989	15106741
1990	15106741
1991	15106741
1992	15106741
1993	15106741
1994	15106741
1995	15106741
1996	15106741
1997	15106741
1998	15106741
1999	15106741
2000	15106741
2001	15106741
2002	15106741
2003	15106741
2004	15142775.114
2005	15142774.169
2006	15142743.93
2007	15142711.599
2008	15142728.542
2009	15142740.862
2010	15142735.451
2011	15142981.029000001
2012	15162047.533
2013	15162015.412
2014	15162001.958
2015	15162055.541
2016	15162042.92
2017	15162037.283
2018	15162043.383
2019	15162047.118
2020	15162005.871
2021	15162005.871