Year	% of land area
1961	69.98597251888928
1962	69.99394267861128
1963	70.00191283833328
1964	70.00988299805529
1965	70.01785315777728
1966	70.02582331749927
1967	70.03379347722128
1968	70.04176363694329
1969	70.04973379666528
1970	70.05770395638729
1971	70.06567411610929
1972	70.0736442758313
1973	70.08161443555329
1974	70.08958459527528
1975	70.09755475499729
1976	70.10552491471928
1977	70.11349507444129
1978	70.1214652341633
1979	70.1294353938853
1980	70.1374055536073
1981	70.1453757133293
1982	70.1533458730513
1983	70.1613160327733
1984	70.16928619249529
1985	70.1772563522173
1986	70.1852265119393
1987	70.1931966716613
1988	70.1995727994389
1989	70.2011668313833
1990	70.2043548952721
1991	70.2043548952721
1992	70.2059489272165
1993	70.2075429591609
1994	70.2171071508273
1995	70.2266713424937
1996	70.2346415022157
1997	70.2426116619377
1998	70.2442056938821
1999	70.2442056938821
2000	70.2442056938821
2001	70.25058182165971
2002	70.2808684286033
2003	70.31115503554692
2004	70.38766856887813
2005	70.33825357860172
2006	70.25855198138171
2007	70.17885038416169
2008	70.33825357860172
2009	70.33825357860172
2010	70.33825357860172
2011	70.17885038416169
2012	70.17885038416169
2013	70.33825357860172
2014	70.33825357860172
2015	70.33825357860172
2016	70.33825357860172
2017	70.33825357860172
2018	70.33825357860172
2019	70.33984761054612
2020	70.34144164249052
2021	70.34303567443492