Year	% of land area
1961	0.004851072086931212
1962	0.004851072086931212
1963	0.005821286504317454
1964	0.006791500921703697
1965	0.007761715339089939
1966	0.006791500921703697
1967	0.005821286504317454
1968	0.004851072086931212
1969	0.004851072086931212
1970	0.004851072086931212
1971	0.0038808576695449695
1972	0.0038808576695449695
1973	0.0038808576695449695
1974	0.0038808576695449695
1975	0.0038808576695449695
1976	0.0038808576695449695
1977	0.0038808576695449695
1978	0.0038808576695449695
1979	0.0038808576695449695
1980	0.0038808576695449695
1981	0.0038808576695449695
1982	0.0038808576695449695
1983	0.0038808576695449695
1984	0.004851072086931212
1985	0.004851072086931212
1986	0.004851072086931212
1987	0.004851072086931212
1988	0.004851072086931212
1989	0.004851072086931212
1990	0.005821286504317454
1991	0.005821286504317454
1992	0.007761715339089939
1993	0.008731929756476181
1994	0.009702144173862424
1995	0.009702144173862424
1996	0.009702144173862424
1997	0.009702144173862424
1998	0.009702144173862424
1999	0.009702144173862424
2000	0.009702144173862424
2001	0.009702144173862424
2002	0.009702144173862424
2003	0.009702144173862424
2004	0.009702144173862424
2005	0.009702144173862424
2006	0.009702144173862424
2007	0.009702144173862424
2008	0.009702144173862424
2009	0.009702144173862424
2010	0.009702144173862424
2011	0.009702144173862424
2012	0.009702144173862424
2013	0.009702144173862424
2014	0.009702144173862424
2015	0.009702144173862424
2016	0.009702144173862424
2017	0.009702144173862424
2018	0.009702144173862424
2019	0.009702144173862424
2020	0.009702144173862424
2021	0.009702144173862424