Year	% of land area
1961	33.09431880860452
1962	33.09431880860452
1963	33.09431880860452
1964	33.09431880860452
1965	33.09431880860452
1966	33.09431880860452
1967	33.09431880860452
1968	33.09431880860452
1969	33.09431880860452
1970	33.09431880860452
1971	33.09431880860452
1972	33.09431880860452
1973	33.09431880860452
1974	33.09431880860452
1975	33.09431880860452
1976	33.09431880860452
1977	33.09431880860452
1978	34.932892075749216
1979	35.852178709321564
1980	35.852178709321564
1981	35.852178709321564
1982	35.852178709321564
1983	35.852178709321564
1984	36.77146534289392
1985	36.77146534289392
1986	36.77146534289392
1987	37.13917999632285
1988	37.69075197646627
1989	37.69075197646627
1990	38.0584666298952
1991	38.42618128332414
1992	38.79389593675308
1993	39.161610590182015
1994	39.529325243610955
1995	39.897039897039896
1996	40.26475455046884
1997	40.63246920389778
1998	41.00018385732672
1999	41.36789851075565
2000	41.73561316418459
2001	42.10332781761353
2002	42.471042471042466
2003	42.838757124471414
2004	43.206471777900354
2005	43.57418643132929
2006	43.94190108475823
2007	44.30961573818717
2008	44.6773303916161
2009	45.04504504504504
2010	45.22890237175952
2011	45.22890237175952
2012	48.722191579334435
2013	48.722191579334435
2014	48.722191579334435
2015	48.722191579334435
2016	48.722191579334435
2017	48.722191579334435
2018	48.722191579334435
2019	48.722191579334435
2020	48.722191579334435
2021	48.722191579334435