Year	% of land area
1961	0.04487179487179487
1962	0.04487179487179487
1963	0.038461538461538464
1964	0.04487179487179487
1965	0.038461538461538464
1966	0.038461538461538464
1967	0.038461538461538464
1968	0.038461538461538464
1969	0.05128205128205128
1970	0.05128205128205128
1971	0.05128205128205128
1972	0.05128205128205128
1973	0.05128205128205128
1974	0.05128205128205128
1975	0.05128205128205128
1976	0.05128205128205128
1977	0.05128205128205128
1978	0.05128205128205128
1979	0.05128205128205128
1980	0.057692307692307696
1981	0.057692307692307696
1982	0.057692307692307696
1983	0.057692307692307696
1984	0.057692307692307696
1985	0.0641025641025641
1986	0.0641025641025641
1987	0.07051282051282051
1988	0.07051282051282051
1989	0.07051282051282051
1990	0.07051282051282051
1991	0.07051282051282051
1992	0.07051282051282051
1993	0.07051282051282051
1994	0.07051282051282051
1995	0.07051282051282051
1996	0.07051282051282051
1997	0.0641025641025641
1998	0.0641025641025641
1999	0.0641025641025641
2000	0.0641025641025641
2001	0.05128205128205128
2002	0.04487179487179487
2003	0.038461538461538464
2004	0.038461538461538464
2005	0.038461538461538464
2006	0.038461538461538464
2007	0.038461538461538464
2008	0.03205128205128205
2009	0.03205128205128205
2010	0.038461538461538464
2011	0.03205128205128205
2012	0.03205128205128205
2013	0.038461538461538464
2014	0.038461538461538464
2015	0.038461538461538464
2016	0.038461538461538464
2017	0.038461538461538464
2018	0.038461538461538464
2019	0.03205128205128205
2020	0.03205128205128205
2021	0.02564102564102564