Year	sq. km
1961	15922288.742
1962	15922288.742
1963	15922288.742
1964	15922288.742
1965	15922288.742
1966	15922288.742
1967	15922288.742
1968	15922288.742
1969	15922288.742
1970	15922288.742
1971	15922288.742
1972	15922288.742
1973	15922258.742
1974	15922218.742
1975	15922198.742
1976	15922198.742
1977	15922198.742
1978	15922198.742
1979	15922198.742
1980	15922198.742
1981	15922198.742
1982	15922198.742
1983	15922198.742
1984	15922198.742
1985	15922198.742
1986	15922198.742
1987	15922198.742
1988	15922198.742
1989	15922198.742
1990	15922198.742
1991	15923538.742
1992	15923538.742
1993	15923538.742
1994	15923538.742
1995	15923528.742
1996	15923518.742
1997	15923518.742
1998	15923518.742
1999	15923518.742
2000	15975027.742
2001	15975051.942
2002	15974511.168
2003	15981277.758
2004	15980915.519
2005	15983621.891
2006	15986704.493
2007	15986516.893000001
2008	15986546.887
2009	15986507.134
2010	15986826.418
2011	15986805.947
2012	15986838.946
2013	15986320.383
2014	15986683.921
2015	15986698.4
2016	15986401.4
2017	15986337.4
2018	15986313
2019	15986316
2020	15986534.803
2021	16001571.47