Year	sq. km
1961	12320
1962	12320
1963	12330
1964	12300
1965	12370
1966	12400
1967	12440
1968	12400
1969	12350
1970	12300
1971	12000
1972	11740
1973	11460
1974	11220
1975	10800
1976	10750
1977	11090
1978	11140
1979	11170
1980	11180
1981	11160
1982	11140
1983	11100
1984	11130
1985	11120
1986	11110
1987	11110
1988	11170
1989	11100
1990	11210
1991	11270
1992	11270
1993	11260
1994	11260
1995	11270
1996	11310
1997	11350
1998	11390
1999	11450
2000	11440
2001	11390
2002	11400
2003	11210
2004	11220
2005	10770
2006	11200
2007	11190
2008	11810
2009	12013
2010	12013
2011	12010
2012	12013
2013	11873
2014	11742.9
2015	11743
2016	11817
2017	11742.81
2018	11740.81
2019	11740
2020	11655.55
2021	11363.3