Year	% of land area
1961	4.416058998548221
1962	4.416058998548221
1963	4.416058998548221
1964	4.416058998548221
1965	4.416058998548221
1966	4.416058998548221
1967	4.416058998548221
1968	4.416058998548221
1969	4.416058998548221
1970	4.416058998548221
1971	4.416058998548221
1972	4.416058998548221
1973	4.416058998548221
1974	4.416058998548221
1975	4.416058998548221
1976	4.416058998548221
1977	4.416058998548221
1978	4.416058998548221
1979	4.416058998548221
1980	4.416058998548221
1981	4.416058998548221
1982	4.416058998548221
1983	4.416058998548221
1984	4.368034356939009
1985	4.597669424863516
1986	4.908449576886347
1987	5.22971786903073
1988	5.664699680387731
1989	5.675739827884101
1990	6.469526432873144
1991	6.467318403373869
1992	6.321036449046959
1993	6.672113139431543
1994	7.200936204507692
1995	7.637574037989148
1996	7.6453021412366065
1997	7.6453021412366065
1998	7.728103247459386
1999	8.280110622277913
2000	8.255575576066075
2001	8.734931577257008
2002	9.05450224471763
2003	9.374072912178253
2004	9.427334690088356
2005	9.533858245908563
2006	10.119737802919705
2007	10.652355582020741
2008	10.812140915751051
2009	11.184973361121777
2010	11.184973361121777
2011	11.717591140222815
2012	11.717591140222815
2013	11.983900029773334
2014	12.143685363503645
2015	12.250208919323851
2016	12.516517808874372
2017	13.848062256626964
2018	14.167632924087586
2019	14.274156479907793
2020	14.380680035728
2021	14.42494047479623