Year	% of land area
1961	49.308176100628934
1962	49.937106918238996
1963	49.937106918238996
1964	50.25157232704402
1965	50.56603773584906
1966	50.56603773584906
1967	50.786163522012586
1968	50.786163522012586
1969	50.943396226415096
1970	50.943396226415096
1971	51.257861635220124
1972	51.28930817610063
1973	51.698113207547166
1974	52.27987421383647
1975	52.56289308176101
1976	52.9559748427673
1977	53.71069182389937
1978	54.119496855345915
1979	54.166666666666664
1980	54.26100628930818
1981	54.62264150943397
1982	55.00000000000001
1983	55.295597484276726
1984	56.29245283018868
1985	57.16981132075472
1986	57.484276729559745
1987	57.861635220125784
1988	58.867924528301884
1989	59.18238993710692
1990	59.528301886792455
1991	59.59119496855346
1992	60.37735849056604
1993	61.32704402515723
1994	61.94968553459119
1995	62.264150943396224
1996	62.264150943396224
1997	61.94968553459119
1998	61.94968553459119
1999	61.63522012578616
2000	61.63522012578616
2001	61.63522012578616
2002	61.63522012578616
2003	61.63522012578616
2004	62.893081761006286
2005	63.52201257861635
2006	63.83647798742138
2007	64.77987421383648
2008	64.77987421383648
2009	64.77987421383648
2010	64.77987421383648
2011	64.77987421383648
2012	65.09433962264151
2013	66.66666666666666
2014	67.13836477987421
2015	69.81132075471697
2016	68.86792452830188
2017	69.18238993710692
2018	72.79874213836479
2019	73.0503144654088
2020	73.27044025157232
2021	73.89937106918238