Year	% of land area
1961	14.325248250040698
1962	14.32117857724239
1963	14.223506430083022
1964	14.125834282923652
1965	14.032231808562592
1966	13.934559661403224
1967	13.836887514243854
1968	13.739215367084487
1969	13.641543219925117
1970	13.547940745564057
1971	13.450268598404689
1972	13.352596451245319
1973	13.254924304085952
1974	13.161321829724889
1975	13.063649682565522
1976	12.965977535406154
1977	12.868305388246783
1978	12.770633241087417
1979	12.677030766726356
1980	12.579358619566989
1981	12.481686472407619
1982	12.38401432524825
1983	12.286342178088882
1984	12.19273970372782
1985	12.095067556568452
1986	11.997395409409084
1987	11.899723262249715
1988	11.806120787888654
1989	11.708448640729285
1990	11.610776493569917
1991	11.513104346410548
1992	11.41543219925118
1993	11.321829724890119
1994	11.22415757773075
1995	11.126485430571382
1996	11.130555103369689
1997	11.134624776167996
1998	11.138694448966303
1999	11.14276412176461
2000	11.146833794562918
2001	11.150903467361225
2002	11.154973140159532
2003	11.159042812957837
2004	11.163112485756145
2005	11.154973140159532
2006	11.191600195344293
2007	11.395083835259644
2008	11.598567475174997
2009	11.598567475174997
2010	11.802051115090347
2011	11.802051115090347
2012	12.209018394921047
2013	12.615985674751752
2014	12.615985674751752
2015	12.615985674751752
2016	12.615985674751752
2017	12.615985674751752
2018	12.615985674751752
2019	12.615985674751752
2020	12.615985674751752
2021	12.615985674751752