Year	sq. km
1961	32210843
1962	32210843
1963	32210843
1964	32210843
1965	32210843
1966	32210843
1967	32210843
1968	32210843
1969	32210843
1970	32210843
1971	32210843
1972	32210843
1973	32210813
1974	32210773
1975	32210753
1976	32210623
1977	32210623
1978	32210623
1979	32210623
1980	32210623
1981	32210623
1982	32210623
1983	32210623
1984	32210623
1985	32210623
1986	32210623
1987	32210623
1988	32210623
1989	32210623
1990	32210623
1991	32211323
1992	33246633
1993	33145633
1994	33138710
1995	33138710
1996	33138710
1997	33138710
1998	33110230
1999	33110230
2000	33187094
2001	33187040
2002	33187040
2003	33186826
2004	33313586.297
2005	33313534.766
2006	33313719.221
2007	33313941.059
2008	33313661.395999998
2009	33314189.692
2010	33314070.952
2011	33314027.061
2012	33313888.022
2013	33313797.048
2014	33312370.281999998
2015	33317194.353
2016	33316932.509
2017	33310584.82
2018	33310596.429
2019	33309810.858
2020	33309874.265
2021	33324923.735