Year	% of land area
1961	4.87268967299987
1962	5.001938735944164
1963	5.131187798888457
1964	5.260436861832752
1965	5.337986299599328
1966	5.518934987721339
1967	5.648184050665632
1968	5.777433113609926
1969	5.90668217655422
1970	6.035931239498513
1971	6.165180302442808
1972	6.242729740209383
1973	6.242729740209383
1974	6.371978803153677
1975	6.371978803153677
1976	6.371978803153677
1977	6.371978803153677
1978	6.371978803153677
1979	6.371978803153677
1980	6.475378053509112
1981	6.5787773038645465
1982	6.682176554219982
1983	6.785575804575417
1984	6.888975054930851
1985	6.992374305286287
1986	7.095773555641721
1987	7.212097712291586
1988	7.315496962647021
1989	7.418896213002456
1990	7.5222954633578905
1991	7.625694713713325
1992	7.729093964068761
1993	7.832493214424195
1994	8.013441902546207
1995	8.039291715135064
1996	8.788936280211969
1997	9.047434406100557
1998	8.788936280211969
1999	9.17668346904485
2000	9.305932531989143
2001	9.305932531989143
2002	9.435181594933436
2003	9.435181594933436
2004	9.822928783766317
2005	10.081426909654905
2006	10.59842316143208
2007	10.339925035543493
2008	10.986170350264961
2009	10.59842316143208
2010	10.339925035543493
2011	10.856921287320667
2012	10.339925035543493
2013	10.339925035543493
2014	10.339925035543493
2015	10.339925035543493
2016	10.339925035543493
2017	10.339925035543493
2018	10.339925035543493
2019	10.339925035543493
2020	10.339925035543493
2021	10.339925035543493