Year	% of land area
1961	0.999000999000999
1962	0.999000999000999
1963	0.999000999000999
1964	0.999000999000999
1965	0.999000999000999
1966	0.999000999000999
1967	0.999000999000999
1968	0.999000999000999
1969	0.999000999000999
1970	0.999000999000999
1971	0.999000999000999
1972	0.999000999000999
1973	0.999000999000999
1974	0.999000999000999
1975	0.999000999000999
1976	1.098901098901099
1977	1.098901098901099
1978	1.098901098901099
1979	1.098901098901099
1980	1.098901098901099
1981	1.098901098901099
1982	1.098901098901099
1983	1.098901098901099
1984	1.098901098901099
1985	1.098901098901099
1986	1.098901098901099
1987	1.098901098901099
1988	1.098901098901099
1989	1.098901098901099
1990	1.098901098901099
1991	1.098901098901099
1992	1.098901098901099
1993	1.098901098901099
1994	0.999000999000999
1995	0.999000999000999
1996	0.999000999000999
1997	0.999000999000999
1998	0.999000999000999
1999	0.999000999000999
2000	1.098901098901099
2001	1.098901098901099
2002	1.098901098901099
2003	1.098901098901099
2004	1.098901098901099
2005	1.098901098901099
2006	1.098901098901099
2007	1.098901098901099
2008	1.098901098901099
2009	1.098901098901099
2010	1.1988011988011988
2011	1.2987012987012987
2012	1.2987012987012987
2013	1.2987012987012987
2014	1.2987012987012987
2015	1.2987012987012987
2016	1.2987012987012987
2017	1.2987012987012987
2018	1.2987012987012987
2019	1.2987012987012987
2020	1.2987012987012987
2021	1.2987012987012987