Year	% of land area
1961	1.5686274509803921
1962	1.4973262032085561
1963	1.4616755793226381
1964	1.3903743315508021
1965	1.3547237076648841
1966	1.2834224598930482
1967	1.2477718360071302
1968	1.1764705882352942
1969	1.1408199643493762
1970	1.06951871657754
1971	1.033868092691622
1972	1.1051693404634582
1973	1.06951871657754
1974	0.9982174688057042
1975	0.9625668449197862
1976	0.8912655971479502
1977	0.8556149732620321
1978	0.7843137254901961
1979	0.7486631016042781
1980	0.6773618538324421
1981	0.6417112299465241
1982	0.5704099821746881
1983	0.53475935828877
1984	0.53475935828877
1985	0.53475935828877
1986	0.53475935828877
1987	0.53475935828877
1988	0.53475935828877
1989	0.53475935828877
1990	0.5704099821746881
1991	0.5704099821746881
1992	0.6060606060606061
1993	0.6060606060606061
1994	0.6060606060606061
1995	0.6060606060606061
1996	0.6417112299465241
1997	0.6773618538324421
1998	0.7130124777183601
1999	0.7130124777183601
2000	0.7843137254901961
2001	1.06951871657754
2002	1.3190730837789661
2003	1.3190730837789661
2004	1.3190730837789661
2005	1.3190730837789661
2006	1.4616755793226381
2007	1.4616755793226381
2008	1.6399286987522281
2009	1.9251336898395723
2010	1.9251336898395723
2011	1.9251336898395723
2012	1.9251336898395723
2013	1.9251336898395723
2014	1.9251336898395723
2015	1.9251336898395723
2016	1.9251336898395723
2017	1.9251336898395723
2018	1.9251336898395723
2019	1.8894830659536541
2020	1.8894830659536541
2021	1.8894830659536541