Year	% of land area
1961	64.70588235294117
1962	64.70588235294117
1963	64.70588235294117
1964	64.70588235294117
1965	64.70588235294117
1966	64.70588235294117
1967	64.70588235294117
1968	64.70588235294117
1969	64.70588235294117
1970	64.70588235294117
1971	64.70588235294117
1972	58.82352941176471
1973	58.82352941176471
1974	58.82352941176471
1975	58.82352941176471
1976	58.82352941176471
1977	58.82352941176471
1978	55.88235294117647
1979	55.88235294117647
1980	47.05882352941176
1981	47.05882352941176
1982	47.05882352941176
1983	47.05882352941176
1984	47.05882352941176
1985	41.17647058823529
1986	41.17647058823529
1987	38.23529411764706
1988	38.23529411764706
1989	38.23529411764706
1990	38.23529411764706
1991	35.294117647058826
1992	35.294117647058826
1993	35.294117647058826
1994	35.294117647058826
1995	32.35294117647059
1996	32.35294117647059
1997	32.35294117647059
1998	32.35294117647059
1999	35.294117647058826
2000	35.294117647058826
2001	38.23529411764706
2002	38.23529411764706
2003	35.294117647058826
2004	35.294117647058826
2005	26.47058823529412
2006	26.47058823529412
2007	26.47058823529412
2008	26.47058823529412
2009	29.411764705882355
2010	29.411764705882355
2011	29.411764705882355
2012	23.52941176470588
2013	23.52941176470588
2014	23.52941176470588
2015	23.52941176470588
2016	23.52941176470588
2017	23.52941176470588
2018	23.52941176470588
2019	23.52941176470588
2020	23.52941176470588
2021	23.52941176470588