Year	% of land area
1961	1.86219739292365
1962	1.86219739292365
1963	1.9646182495344506
1964	1.9832402234636872
1965	1.8435754189944136
1966	1.797020484171322
1967	2.132216014897579
1968	2.085661080074488
1969	3.5567970204841712
1970	2.8119180633147116
1971	3.687150837988827
1972	3.677839851024209
1973	3.677839851024209
1974	3.677839851024209
1975	2.793296089385475
1976	2.793296089385475
1977	2.793296089385475
1978	2.793296089385475
1979	3.2588454376163876
1980	3.2588454376163876
1981	3.2588454376163876
1982	3.2588454376163876
1983	3.2588454376163876
1984	3.7243947858473
1985	3.7243947858473
1986	3.7243947858473
1987	3.7243947858473
1988	3.7243947858473
1989	3.7243947858473
1990	4.189944134078212
1991	4.189944134078212
1992	4.655493482309125
1993	4.655493482309125
1994	4.655493482309125
1995	4.655493482309125
1996	5.121042830540038
1997	5.176908752327747
1998	5.121042830540038
1999	5.121042830540038
2000	5.121042830540038
2001	4.767225325884543
2002	4.126327662374283
2003	4.041353383458646
2004	4.02217836669486
2005	3.9928598271326567
2006	4.012026684205581
2007	3.9270950770387074
2008	3.9458850056369785
2009	3.9458850056369785
2010	3.9458850056369785
2011	3.9302658544117235
2012	3.9381522564674776
2013	4.034734216081366
2014	4.102095750817151
2015	4.837656099903938
2016	4.640522875816994
2017	6.290944123314065
2018	6.290944123314065
2019	6.290944123314065
2020	6.290944123314065
2021	6.290944123314065