Year	% of land area
1961	4.3927648578811365
1962	4.3927648578811365
1963	4.3927648578811365
1964	4.3927648578811365
1965	4.3927648578811365
1966	4.3927648578811365
1967	4.3927648578811365
1968	4.3927648578811365
1969	4.3927648578811365
1970	4.3927648578811365
1971	4.3927648578811365
1972	4.3927648578811365
1973	4.3927648578811365
1974	4.478897502153316
1975	4.478897502153316
1976	4.478897502153316
1977	4.478897502153316
1978	4.478897502153316
1979	4.565030146425495
1980	4.7372954349698535
1981	4.823428079242033
1982	4.909560723514212
1983	4.995693367786391
1984	5.0818260120585705
1985	5.0818260120585705
1986	5.167958656330749
1987	5.254091300602928
1988	5.254091300602928
1989	5.167958656330749
1990	5.254091300602928
1991	5.254091300602928
1992	5.512489233419466
1993	5.598621877691645
1994	5.598621877691645
1995	5.598621877691645
1996	5.684754521963824
1997	5.684754521963824
1998	5.684754521963824
1999	5.684754521963824
2000	5.684754521963824
2001	5.710594315245478
2002	5.658914728682171
2003	5.701981050818261
2004	5.615848406546081
2005	5.564168819982774
2006	5.624461670973299
2007	5.684754521963824
2008	5.74504737295435
2009	5.805340223944875
2010	5.8656330749354
2011	5.9259259259259265
2012	5.986218776916451
2013	6.046511627906977
2014	6.179286335944299
2015	6.179286335944299
2016	6.179286335944299
2017	6.266318537859007
2018	6.440382941688425
2019	6.440382941688425
2020	6.440382941688425
2021	6.440382941688425