Year	% of land area
1961	45.87722548656327
1962	45.87722548656327
1963	45.87722548656327
1964	45.87722548656327
1965	45.87898999523583
1966	45.87898999523583
1967	45.87898999523583
1968	45.87898999523583
1969	45.87898999523583
1970	45.87898999523583
1971	45.87898999523583
1972	45.88075450390839
1973	45.88075450390839
1974	45.88075450390839
1975	45.88075450390839
1976	45.88075450390839
1977	45.88075450390839
1978	45.88075450390839
1979	45.88428352125351
1980	45.88428352125351
1981	45.88428352125351
1982	45.887812538598624
1983	45.887812538598624
1984	45.887812538598624
1985	45.89134155594375
1986	45.89134155594375
1987	45.89487057328886
1988	45.89487057328886
1989	45.90369311665167
1990	45.91428016868703
1991	45.70253912797981
1992	45.61431369435181
1993	45.79076456160782
1994	45.87016745187303
1995	45.78194201824502
1996	45.78194201824502
1997	45.70253912797981
1998	45.579023520900606
1999	45.596668607626206
2000	45.79076456160782
2001	45.5260882607238
2002	45.60549115098901
2003	45.517265717361
2004	45.57196548621037
2005	45.55079138213964
2006	45.529617278068926
2007	45.49609161329028
2008	45.66724895452861
2009	45.73253577541333
2010	45.63195878107741
2011	45.74665184479382
2012	45.67783600656397
2013	45.66901346320117
2014	45.88428352125351
2015	45.63301748628095
2016	45.63301748628095
2017	45.63301748628095
2018	45.63301748628095
2019	45.633723289749966
2020	45.633723289749966
2021	45.633723289749966