Year	% of land area
1961	3.310176428104687
1962	3.3359700106613475
1963	3.3617635932180074
1964	3.387557175774667
1965	3.4133507583313274
1966	3.439144340887987
1967	3.464937923444647
1968	3.4907315060013073
1969	3.5251229494101866
1970	3.542318671114627
1971	3.5595143928190667
1972	3.593905836227947
1973	3.611101557932386
1974	3.6523712900230425
1975	3.948137703339409
1976	3.9361006981463014
1977	4.200914812394676
1978	4.298930426109983
1979	4.333321869518864
1980	4.3677133129277435
1981	4.402104756336624
1982	4.419300478041063
1983	4.470887643154383
1984	4.505279086563263
1985	4.556866251676583
1986	4.591257695085463
1987	4.608453416789902
1988	4.642844860198783
1989	4.660040581903222
1990	4.677236303607662
1991	4.728823468720982
1992	4.780410633834302
1993	4.986759294287581
1994	4.986759294287581
1995	4.986759294287581
1996	4.986759294287581
1997	4.986759294287581
1998	4.986759294287581
1999	4.986759294287581
2000	4.986759294287581
2001	5.072737902809781
2002	5.072737902809781
2003	5.072737902809781
2004	5.072737902809781
2005	5.158716511331981
2006	5.158716511331981
2007	5.158716511331981
2008	5.158716511331981
2009	5.158716511331981
2010	5.158716511331981
2011	5.156455452521937
2012	5.156455452521937
2013	5.156411137848058
2014	5.156411137848058
2015	5.156411137848058
2016	5.156411137848058
2017	5.156411137848058
2018	5.156411137848058
2019	5.156411137848058
2020	5.156411137848058
2021	5.156411137848058