Year	% of land area
1961	7.6923076923076925
1962	7.6923076923076925
1963	10.256410256410255
1964	10.256410256410255
1965	10.256410256410255
1966	10.256410256410255
1967	10.256410256410255
1968	10.256410256410255
1969	10.256410256410255
1970	10.256410256410255
1971	10.256410256410255
1972	10.256410256410255
1973	10.256410256410255
1974	10.256410256410255
1975	10.256410256410255
1976	10.256410256410255
1977	10.256410256410255
1978	10.256410256410255
1979	12.82051282051282
1980	12.82051282051282
1981	12.82051282051282
1982	12.82051282051282
1983	15.384615384615385
1984	15.384615384615385
1985	15.384615384615385
1986	17.94871794871795
1987	16.025641025641026
1988	15.384615384615385
1989	14.743589743589745
1990	14.102564102564102
1991	13.461538461538462
1992	12.82051282051282
1993	12.179487179487179
1994	11.538461538461538
1995	10.897435897435898
1996	10.256410256410255
1997	9.615384615384617
1998	8.974358974358974
1999	8.333333333333332
2000	7.6923076923076925
2001	7.6923076923076925
2002	7.6923076923076925
2003	7.6923076923076925
2004	7.6923076923076925
2005	7.6923076923076925
2006	7.6923076923076925
2007	7.6923076923076925
2008	7.6923076923076925
2009	7.6923076923076925
2010	7.6923076923076925
2011	7.6923076923076925
2012	7.6923076923076925
2013	7.6923076923076925
2014	7.6923076923076925
2015	7.6923076923076925
2016	7.6923076923076925
2017	7.6923076923076925
2018	7.6923076923076925
2019	7.6923076923076925
2020	7.6923076923076925
2021	7.6923076923076925