Year	% of land area
1961	48.148148148148145
1962	48.148148148148145
1963	53.086419753086425
1964	53.086419753086425
1965	53.086419753086425
1966	53.086419753086425
1967	46.913580246913575
1968	46.913580246913575
1969	46.913580246913575
1970	46.913580246913575
1971	46.913580246913575
1972	46.913580246913575
1973	46.913580246913575
1974	46.913580246913575
1975	46.913580246913575
1976	46.913580246913575
1977	46.913580246913575
1978	46.913580246913575
1979	46.913580246913575
1980	46.913580246913575
1981	46.913580246913575
1982	46.913580246913575
1983	46.913580246913575
1984	48.148148148148145
1985	48.148148148148145
1986	48.148148148148145
1987	48.148148148148145
1988	48.148148148148145
1989	48.148148148148145
1990	48.148148148148145
1991	48.148148148148145
1992	48.148148148148145
1993	45.67901234567901
1994	45.67901234567901
1995	45.67901234567901
1996	45.67901234567901
1997	45.67901234567901
1998	41.9753086419753
1999	41.9753086419753
2000	41.9753086419753
2001	41.9753086419753
2002	41.9753086419753
2003	41.9753086419753
2004	41.9753086419753
2005	41.9753086419753
2006	41.9753086419753
2007	41.9753086419753
2008	41.9753086419753
2009	41.9753086419753
2010	41.9753086419753
2011	41.9753086419753
2012	41.9753086419753
2013	41.9753086419753
2014	41.9753086419753
2015	41.9753086419753
2016	41.9753086419753
2017	41.9753086419753
2018	41.9753086419753
2019	41.9753086419753
2020	41.9753086419753
2021	41.9753086419753