Year	% of land area
1961	14.492753623188406
1962	14.492753623188406
1963	14.492753623188406
1964	14.492753623188406
1965	14.492753623188406
1966	14.492753623188406
1967	14.492753623188406
1968	14.492753623188406
1969	14.492753623188406
1970	14.492753623188406
1971	14.492753623188406
1972	14.492753623188406
1973	14.492753623188406
1974	14.492753623188406
1975	14.492753623188406
1976	14.492753623188406
1977	14.492753623188406
1978	14.492753623188406
1979	14.492753623188406
1980	14.492753623188406
1981	14.492753623188406
1982	14.492753623188406
1983	14.492753623188406
1984	14.492753623188406
1985	14.492753623188406
1986	14.492753623188406
1987	14.492753623188406
1988	14.492753623188406
1989	14.492753623188406
1990	14.492753623188406
1991	14.492753623188406
1992	14.084507042253522
1993	14.084507042253522
1994	14.084507042253522
1995	14.084507042253522
1996	14.084507042253522
1997	14.084507042253522
1998	14.084507042253522
1999	14.084507042253522
2000	13.943661971830986
2001	13.788732394366196
2002	13.64788732394366
2003	13.305555555555557
2004	12.986301369863012
2005	12.662162162162163
2006	12.527027027027026
2007	12.213333333333333
2008	11.921052631578947
2009	11.776315789473685
2010	11.614173228346457
2011	11.395045632333769
2012	11.220779220779221
2013	11.077922077922079
2014	10.933852140077821
2015	10.69408740359897
2016	10.551989730423621
2017	10.397435897435898
2018	10.411311053984576
2019	10.384615384615385
2020	10.318471337579618
2021	10.253164556962027