Year	% of land area
1961	2.0872865275142316
1962	2.0872865275142316
1963	2.0872865275142316
1964	2.6565464895635675
1965	2.6565464895635675
1966	2.0872865275142316
1967	2.0872865275142316
1968	2.2770398481973433
1969	2.2770398481973433
1970	2.2770398481973433
1971	1.7077798861480076
1972	1.5180265654648957
1973	1.5180265654648957
1974	1.5180265654648957
1975	1.5180265654648957
1976	1.3282732447817838
1977	0.9487666034155597
1978	0.9487666034155597
1979	0.9487666034155597
1980	0.9487666034155597
1981	0.9487666034155597
1982	0.7590132827324478
1983	0.7590132827324478
1984	0.7590132827324478
1985	0.7590132827324478
1986	0.7590132827324478
1987	0.7590132827324478
1988	0.7590132827324478
1989	0.7590132827324478
1990	0.7590132827324478
1991	0.7590132827324478
1992	0.7590132827324478
1993	0.7590132827324478
1994	0.7590132827324478
1995	0.7590132827324478
1996	0.7590132827324478
1997	0.7590132827324478
1998	0.7590132827324478
1999	0.7590132827324478
2000	0.7590132827324478
2001	0.9487666034155597
2002	0.9487666034155597
2003	0.9487666034155597
2004	0.9487666034155597
2005	0.9487666034155597
2006	0.9487666034155597
2007	0.9487666034155597
2008	0.9487666034155597
2009	1.1385199240986716
2010	1.1385199240986716
2011	1.1385199240986716
2012	1.1385199240986716
2013	1.1385199240986716
2014	1.1385199240986716
2015	1.1385199240986716
2016	1.1385199240986716
2017	1.1385199240986716
2018	1.1385199240986716
2019	1.1385199240986716
2020	1.1385199240986716
2021	1.1385199240986716