Year	% of land area
1961	44.33497536945813
1962	44.827586206896555
1963	44.827586206896555
1964	44.827586206896555
1965	45.320197044334975
1966	43.84236453201971
1967	46.30541871921182
1968	49.26108374384236
1969	49.26108374384236
1970	49.26108374384236
1971	49.26108374384236
1972	49.26108374384236
1973	49.26108374384236
1974	49.26108374384236
1975	48.76847290640394
1976	49.26108374384236
1977	49.26108374384236
1978	49.26108374384236
1979	49.26108374384236
1980	49.26108374384236
1981	49.26108374384236
1982	49.26108374384236
1983	49.26108374384236
1984	49.26108374384236
1985	49.26108374384236
1986	49.26108374384236
1987	49.26108374384236
1988	49.26108374384236
1989	48.76847290640394
1990	48.275862068965516
1991	47.783251231527096
1992	47.29064039408867
1993	46.30541871921182
1994	45.812807881773395
1995	45.320197044334975
1996	44.827586206896555
1997	44.33497536945813
1998	44.827586206896555
1999	43.84236453201971
2000	44.33497536945813
2001	44.827586206896555
2002	43.84236453201971
2003	43.34975369458128
2004	42.857142857142854
2005	41.87192118226601
2006	40.88669950738916
2007	39.90147783251231
2008	39.40886699507389
2009	39.40886699507389
2010	39.40886699507389
2011	39.05858788182273
2012	38.057085628442664
2013	37.55633450175263
2014	37.55633450175263
2015	37.55633450175263
2016	37.55633450175263
2017	37.55633450175263
2018	37.55633450175263
2019	37.55633450175263
2020	37.55633450175263
2021	37.55633450175263