Year	sq. km
1961	1983394
1962	1983394
1963	1983394
1964	1983394
1965	1983394
1966	1983394
1967	1983394
1968	1983394
1969	1983394
1970	1983394
1971	1983394
1972	1983394
1973	1983394
1974	1983394
1975	1983394
1976	1983394
1977	1983394
1978	1983394
1979	1983394
1980	1983394
1981	1983394
1982	1983394
1983	1983394
1984	1983394
1985	1983394
1986	1983394
1987	1983394
1988	1983394
1989	1983394
1990	1983394
1991	1983394
1992	2025804
1993	2025804
1994	2018881
1995	2018881
1996	2018881
1997	2018881
1998	2018881
1999	2018881
2000	2018881
2001	2018881
2002	2018881
2003	2018891
2004	2017218
2005	2017228
2006	2030678
2007	2030688
2008	2030698
2009	2030698
2010	2030700
2011	2030672
2012	2030675
2013	2031755
2014	2031636
2015	2031643
2016	2031671
2017	2030952
2018	2031526
2019	2031528
2020	2031533
2021	2031538