Year	sq. km
1961	3943970
1962	3943970
1963	3943970
1964	3943970
1965	3943970
1966	3943970
1967	3943970
1968	3943970
1969	3943970
1970	3943970
1971	3943970
1972	3943970
1973	3943970
1974	3943970
1975	3943970
1976	3943970
1977	3943970
1978	3943970
1979	3943970
1980	3943970
1981	3943970
1982	3943970
1983	3943970
1984	3943970
1985	3943970
1986	3943970
1987	3943970
1988	3943970
1989	3943970
1990	3943970
1991	3943970
1992	4369370
1993	4369370
1994	4369370
1995	4369370
1996	4369370
1997	4369370
1998	4369370
1999	4369370
2000	4379935
2001	4379881
2002	4379881
2003	4379847
2004	4379823
2005	4379819
2006	4379820
2007	4379954
2008	4379937
2009	4379915
2010	4379862
2011	4379779
2012	4379770
2013	4379759
2014	4379759
2015	4384570
2016	4384561
2017	4384558
2018	4384557
2019	4384525
2020	4384620
2021	4384623