Year	sq. km
1961	19942192
1962	19942192
1963	19942192
1964	19942192
1965	19942192
1966	19942192
1967	19942192
1968	19942192
1969	19942192
1970	19942192
1971	19942192
1972	19942192
1973	19942192
1974	19942192
1975	19942332
1976	19942202
1977	19942202
1978	19942202
1979	19942202
1980	19942112
1981	19942112
1982	19942112
1983	19942112
1984	19942112
1985	19942112
1986	19942112
1987	19942112
1988	19942112
1989	19942112
1990	19942112
1991	19942112
1992	19942112
1993	19942112
1994	19942112
1995	19942112
1996	19942112
1997	19942112
1998	19913632
1999	19913632
2000	19913632
2001	19913632
2002	19913632
2003	19913632
2004	19913632
2005	19913632
2006	19913632
2007	19913632
2008	19913632
2009	19913632
2010	19913632
2011	19913632
2012	19913632
2013	19913632
2014	19913412
2015	19913412
2016	19913412
2017	19913412
2018	19913472
2019	19912693
2020	19912693
2021	19912693