Year	% of land area
1961	0.8203445447087777
1962	0.8203445447087777
1963	0.8203445447087777
1964	0.8203445447087777
1965	1.0664479081214109
1966	1.0664479081214109
1967	1.0664479081214109
1968	1.0664479081214109
1969	1.0664479081214109
1970	1.2305168170631664
1971	1.2305168170631664
1972	1.2305168170631664
1973	1.2305168170631664
1974	1.2305168170631664
1975	1.3125512715340444
1976	1.3125512715340444
1977	1.3945857260049221
1978	1.3945857260049221
1979	1.4766201804757997
1980	1.4766201804757997
1981	1.5586546349466777
1982	1.5586546349466777
1983	1.6406890894175554
1984	1.6406890894175554
1985	1.6406890894175554
1986	1.6406890894175554
1987	1.6406890894175554
1988	1.6406890894175554
1989	1.6406890894175554
1990	1.6406890894175554
1991	1.6406890894175554
1992	1.6406890894175554
1993	1.6406890894175554
1994	1.6406890894175554
1995	1.6406890894175554
1996	1.6406890894175554
1997	1.6406890894175554
1998	1.6406890894175554
1999	1.6406890894175554
2000	1.6406890894175554
2001	1.6406890894175554
2002	1.6406890894175554
2003	1.6406890894175554
2004	1.6406890894175554
2005	1.6406890894175554
2006	1.6406890894175554
2007	1.6406890894175554
2008	1.6406890894175554
2009	1.6406890894175554
2010	1.6406890894175554
2011	1.6406890894175554
2012	1.6406890894175554
2013	1.6406890894175554
2014	1.6406890894175554
2015	1.6406890894175554
2016	1.6406890894175554
2017	1.6406890894175554
2018	1.6406890894175554
2019	1.6406890894175554
2020	1.6406890894175554
2021	1.6406890894175554