Year	% of land area
1961	32.65602322206096
1962	32.65602322206096
1963	32.65602322206096
1964	32.65602322206096
1965	32.65602322206096
1966	32.65602322206096
1967	32.65602322206096
1968	32.65602322206096
1969	32.65602322206096
1970	32.65602322206096
1971	32.65602322206096
1972	27.866473149492016
1973	27.866473149492016
1974	27.866473149492016
1975	27.866473149492016
1976	27.939042089985488
1977	27.939042089985488
1978	28.30188679245283
1979	28.30188679245283
1980	28.30188679245283
1981	28.30188679245283
1982	28.30188679245283
1983	28.30188679245283
1984	28.30188679245283
1985	28.30188679245283
1986	28.30188679245283
1987	28.30188679245283
1988	28.30188679245283
1989	28.30188679245283
1990	28.30188679245283
1991	28.30188679245283
1992	28.30188679245283
1993	28.30188679245283
1994	29.027576197387518
1995	29.027576197387518
1996	29.027576197387518
1997	32.65602322206096
1998	32.65602322206096
1999	32.65602322206096
2000	32.65602322206096
2001	32.65602322206096
2002	32.65602322206096
2003	32.65602322206096
2004	32.65602322206096
2005	36.284470246734394
2006	36.284470246734394
2007	36.284470246734394
2008	36.284470246734394
2009	37.239840348330915
2010	42.815674891146585
2011	42.815674891146585
2012	42.815674891146585
2013	42.815674891146585
2014	42.815674891146585
2015	42.815674891146585
2016	42.815674891146585
2017	42.815674891146585
2018	42.815674891146585
2019	36.284470246734394
2020	36.284470246734394
2021	36.46589259796807