Year	% of land area
1961	20.8955223880597
1962	20.8955223880597
1963	19.402985074626866
1964	19.402985074626866
1965	19.402985074626866
1966	19.402985074626866
1967	19.402985074626866
1968	17.91044776119403
1969	17.91044776119403
1970	17.91044776119403
1971	14.925373134328357
1972	16.417910447761194
1973	16.417910447761194
1974	13.432835820895523
1975	11.940298507462686
1976	11.940298507462686
1977	11.940298507462686
1978	11.940298507462686
1979	11.940298507462686
1980	11.940298507462686
1981	10.44776119402985
1982	8.955223880597014
1983	8.955223880597014
1984	8.955223880597014
1985	7.462686567164178
1986	5.970149253731343
1987	4.477611940298507
1988	4.477611940298507
1989	2.9850746268656714
1990	2.9850746268656714
1991	1.791044776119403
1992	1.791044776119403
1993	1.791044776119403
1994	1.791044776119403
1995	1.791044776119403
1996	1.791044776119403
1997	1.791044776119403
1998	1.791044776119403
1999	1.791044776119403
2000	1.791044776119403
2001	1.791044776119403
2002	1.7777777777777777
2003	1.1644832605531297
2004	1.1611030478955007
2005	1.1030478955007257
2006	1.080691642651297
2007	1.1510791366906474
2008	1
2009	1
2010	1.0541310541310542
2011	1.0369318181818183
2012	1.0339943342776203
2013	0.9476661951909477
2014	0.9308885754583921
2015	0.9308885754583921
2016	0.9308885754583921
2017	0.9269662921348315
2018	0.9243697478991597
2019	0.9217877094972068
2020	0.9192200557103064
2021	0.9192200557103064