Year	% of land area
1961	0.0027378957628325174
1962	0.0027378957628325174
1963	0.0027378957628325174
1964	0.0027378957628325174
1965	0.0027378957628325174
1966	0.0027378957628325174
1967	0.005475791525665035
1968	0.005475791525665035
1969	0.005475791525665035
1970	0.005475791525665035
1971	0.005475791525665035
1972	0.005475791525665035
1973	0.005475791525665035
1974	0.005475791525665035
1975	0.005475791525665035
1976	0.005475791525665035
1977	0.005475791525665035
1978	0.005475791525665035
1979	0.005475791525665035
1980	0.005475791525665035
1981	0.008213687288497553
1982	0.008213687288497553
1983	0.008213687288497553
1984	0.008213687288497553
1985	0.01095158305133007
1986	0.01095158305133007
1987	0.01095158305133007
1988	0.01095158305133007
1989	0.01095158305133007
1990	0.01095158305133007
1991	0.013689478814162586
1992	0.013689478814162586
1993	0.013689478814162586
1994	0.013689478814162586
1995	0.013689478814162586
1996	0.013689478814162586
1997	0.013689478814162586
1998	0.013689478814162586
1999	0.013689478814162586
2000	0.013689478814162586
2001	0.013689478814162586
2002	0.013689478814162586
2003	0.013689478814162586
2004	0.013689478814162586
2005	0.013689478814162586
2006	0.013689478814162586
2007	0.013141899661596082
2008	0.01259432050902958
2009	0.012539562593772929
2010	0.012320530932746328
2011	0.012046741356463078
2012	0.012046741356463078
2013	0.008115622200258235
2014	0.008079801045170195
2015	0.008275128583504454
2016	0.008314488574192008
2017	0.008260230114235477
2018	0.008416687665019665
2019	0.00861148087889694
2020	0.00868825232990653
2021	0.008235649380953688