Year	% of land area
1961	9.429280397022332
1962	9.429280397022332
1963	9.429280397022332
1964	9.429280397022332
1965	9.429280397022332
1966	9.429280397022332
1967	9.429280397022332
1968	9.429280397022332
1969	9.429280397022332
1970	9.429280397022332
1971	9.429280397022332
1972	9.429280397022332
1973	9.429280397022332
1974	9.429280397022332
1975	9.429280397022332
1976	9.429280397022332
1977	9.429280397022332
1978	9.429280397022332
1979	9.429280397022332
1980	9.429280397022332
1981	9.429280397022332
1982	9.429280397022332
1983	9.429280397022332
1984	9.429280397022332
1985	9.429280397022332
1986	9.429280397022332
1987	9.429280397022332
1988	9.925558312655088
1989	9.925558312655088
1990	10.173697270471465
1991	10.173697270471465
1992	10.173697270471465
1993	10.173697270471465
1994	10.173697270471465
1995	10.421836228287841
1996	10.421836228287841
1997	10.918114143920596
1998	10.918114143920596
1999	10.918114143920596
2000	10.918114143920596
2001	11.41439205955335
2002	11.662531017369728
2003	11.662531017369728
2004	11.910669975186105
2005	11.910669975186105
2006	11.910669975186105
2007	11.910669975186105
2008	12.40694789081886
2009	12.40694789081886
2010	12.40694789081886
2011	12.40694789081886
2012	12.40694789081886
2013	12.40694789081886
2014	12.40694789081886
2015	12.40694789081886
2016	12.40694789081886
2017	12.40694789081886
2018	12.40694789081886
2019	12.40694789081886
2020	12.40694789081886
2021	12.40694789081886