Year	% of land area
1961	6.0109289617486334
1962	6.0109289617486334
1963	6.0109289617486334
1964	6.0109289617486334
1965	6.0109289617486334
1966	6.0109289617486334
1967	6.0109289617486334
1968	6.0109289617486334
1969	6.0109289617486334
1970	6.0109289617486334
1971	6.0109289617486334
1972	6.0109289617486334
1973	6.0109289617486334
1974	6.0109289617486334
1975	6.0109289617486334
1976	6.0109289617486334
1977	6.0109289617486334
1978	6.0109289617486334
1979	6.0109289617486334
1980	6.0109289617486334
1981	6.0109289617486334
1982	6.0109289617486334
1983	6.0109289617486334
1984	6.0109289617486334
1985	6.0109289617486334
1986	6.0109289617486334
1987	5.737704918032787
1988	5.737704918032787
1989	5.737704918032787
1990	5.737704918032787
1991	5.737704918032787
1992	5.737704918032787
1993	5.737704918032787
1994	5.46448087431694
1995	5.46448087431694
1996	5.46448087431694
1997	5.46448087431694
1998	5.46448087431694
1999	5.46448087431694
2000	5.762028233938346
2001	5.762028233938346
2002	6.33823105733218
2003	6.33823105733218
2004	6.33823105733218
2005	6.33823105733218
2006	6.33823105733218
2007	6.33823105733218
2008	6.33823105733218
2009	6.33823105733218
2010	6.33823105733218
2011	6.626332469029098
2012	6.626332469029098
2013	6.626332469029098
2014	6.626332469029098
2015	6.626332469029098
2016	6.626332469029098
2017	6.914433880726016
2018	7.202535292422933
2019	7.202535292422933
2020	7.490636704119851
2021	7.490636704119851