Year	% of land area
1961	0.0007894529091339701
1962	0.0007894529091339701
1963	0.0007894529091339701
1964	0.0007894529091339701
1965	0.0015789058182679402
1966	0.0015789058182679402
1967	0.0015789058182679402
1968	0.0015789058182679402
1969	0.0023683587274019105
1970	0.0023683587274019105
1971	0.0031578116365358804
1972	0.0031578116365358804
1973	0.0031578116365358804
1974	0.0031578116365358804
1975	0.0031578116365358804
1976	0.004736717454803821
1977	0.004736717454803821
1978	0.004736717454803821
1979	0.004736717454803821
1980	0.006315623273071761
1981	0.006315623273071761
1982	0.006315623273071761
1983	0.006315623273071761
1984	0.006315623273071761
1985	0.007894529091339702
1986	0.007894529091339702
1987	0.007894529091339702
1988	0.008683982000473671
1989	0.008683982000473671
1990	0.008683982000473671
1991	0.010262887818741611
1992	0.010262887818741611
1993	0.011052340727875582
1994	0.011841793637009553
1995	0.011841793637009553
1996	0.011841793637009553
1997	0.011841793637009553
1998	0.012631246546143522
1999	0.012631246546143522
2000	0.019736322728349256
2001	0.023683587274019105
2002	0.03157811636535881
2003	0.03947264545669851
2004	0.04341991000236836
2005	0.04736717454803821
2006	0.05526170363937791
2007	0.05920896818504776
2008	0.06315623273071762
2009	0.07894529091339703
2010	0.07894529091339703
2011	0.07894529091339703
2012	0.07894529091339703
2013	0.07894529091339703
2014	0.07894529091339703
2015	0.08920817873213863
2016	0.08920817873213863
2017	0.08920817873213863
2018	0.08920817873213863
2019	0.08920817873213863
2020	0.08920817873213863
2021	0.08920817873213863