Year	% of land area
1961	5.797101449275362
1962	5.797101449275362
1963	5.797101449275362
1964	5.797101449275362
1965	5.797101449275362
1966	5.797101449275362
1967	5.797101449275362
1968	5.797101449275362
1969	5.797101449275362
1970	5.797101449275362
1971	5.797101449275362
1972	5.797101449275362
1973	5.797101449275362
1974	5.797101449275362
1975	5.797101449275362
1976	5.797101449275362
1977	5.797101449275362
1978	5.797101449275362
1979	5.797101449275362
1980	5.797101449275362
1981	5.797101449275362
1982	5.797101449275362
1983	5.797101449275362
1984	5.797101449275362
1985	5.797101449275362
1986	5.797101449275362
1987	5.797101449275362
1988	5.797101449275362
1989	5.797101449275362
1990	5.797101449275362
1991	5.797101449275362
1992	5.633802816901409
1993	5.633802816901409
1994	5.633802816901409
1995	5.633802816901409
1996	5.633802816901409
1997	5.633802816901409
1998	5.633802816901409
1999	5.633802816901409
2000	5.47887323943662
2001	5.323943661971831
2002	5.169014084507043
2003	4.944444444444445
2004	4.726027397260274
2005	4.513513513513513
2006	4.364864864864865
2007	4.16
2008	3.9605263157894735
2009	3.8157894736842106
2010	3.661417322834646
2011	3.4941329856584096
2012	3.337662337662338
2013	3.1948051948051948
2014	3.04798962386511
2015	2.879177377892031
2016	2.7342747111681645
2017	2.5897435897435894
2018	2.570694087403599
2019	2.564102564102564
2020	2.547770700636943
2021	2.5316455696202533