Year	% of land area
1961	3.9244186046511627
1962	3.9036544850498336
1963	3.9036544850498336
1964	3.8725083056478407
1965	3.8725083056478407
1966	3.8413621262458473
1967	3.8413621262458473
1968	3.820598006644518
1969	3.820598006644518
1970	3.799833887043189
1971	3.799833887043189
1972	3.799833887043189
1973	3.799833887043189
1974	3.799833887043189
1975	3.799833887043189
1976	3.799833887043189
1977	3.8517441860465116
1978	3.8517441860465116
1979	3.8517441860465116
1980	3.8517441860465116
1981	3.8517441860465116
1982	3.8932724252491697
1983	3.9451827242524917
1984	3.9451827242524917
1985	3.9451827242524917
1986	4.049003322259137
1987	4.049003322259137
1988	4.152823920265781
1989	4.152823920265781
1990	3.6337209302325584
1991	3.6337209302325584
1992	3.6337209302325584
1993	3.6337209302325584
1994	3.6337209302325584
1995	3.6337209302325584
1996	3.6337209302325584
1997	3.8413621262458473
1998	3.9451827242524917
1999	4.152823920265781
2000	4.152823920265781
2001	4.152823920265781
2002	4.152823920265781
2003	4.152823920265781
2004	4.152823920265781
2005	4.152823920265781
2006	4.152823920265781
2007	4.152823920265781
2008	4.464285714285714
2009	4.879568106312292
2010	4.983388704318937
2011	5.191029900332226
2012	5.191029900332226
2013	5.191029900332226
2014	5.191029900332226
2015	5.191029900332226
2016	5.191029900332226
2017	5.191029900332226
2018	5.191029900332226
2019	5.191029900332226
2020	5.191029900332226
2021	5.191029900332226