Year	% of land area
1961	1.4948924507931234
1962	1.4948924507931234
1963	1.4948924507931234
1964	1.4948924507931234
1965	1.4948924507931234
1966	1.4948924507931234
1967	1.4948924507931234
1968	1.4948924507931234
1969	1.4948924507931234
1970	1.4948924507931234
1971	1.4948924507931234
1972	1.4948924507931234
1973	1.4948924507931234
1974	1.4948924507931234
1975	1.4948924507931234
1976	1.4948924507931234
1977	1.4948924507931234
1978	1.4948924507931234
1979	1.4948924507931234
1980	1.4948924507931234
1981	1.4948924507931234
1982	1.4948924507931234
1983	1.4948924507931234
1984	1.4948924507931234
1985	1.4948924507931234
1986	1.4948924507931234
1987	1.4948924507931234
1988	1.4948924507931234
1989	1.4948924507931234
1990	1.4948924507931234
1991	1.4948924507931234
1992	1.4948924507931234
1993	1.6609916119923593
1994	1.6609916119923593
1995	1.6609916119923593
1996	1.6609916119923593
1997	1.6609916119923593
1998	1.6609916119923593
1999	1.6609916119923593
2000	1.6609916119923593
2001	1.6609916119923593
2002	1.6609916119923593
2003	1.6609916119923593
2004	1.6609916119923593
2005	1.6609916119923593
2006	1.6609916119923593
2007	1.6609916119923593
2008	1.6609916119923593
2009	1.8270907731915955
2010	1.9101403537912134
2011	1.9101403537912134
2012	1.9101403537912134
2013	1.9101403537912134
2014	2.0347147246906405
2015	2.159289095590067
2016	2.159289095590067
2017	2.1177643052902586
2018	2.1177643052902586
2019	2.0762395149904496
2020	2.0762395149904496
2021	2.0762395149904496