Year	% of land area
1961	10.869565217391305
1962	10.869565217391305
1963	10.869565217391305
1964	10.869565217391305
1965	10.869565217391305
1966	10.869565217391305
1967	10.869565217391305
1968	10.869565217391305
1969	10.869565217391305
1970	10.869565217391305
1971	10.869565217391305
1972	10.869565217391305
1973	10.869565217391305
1974	10.869565217391305
1975	10.869565217391305
1976	10.869565217391305
1977	10.869565217391305
1978	10.869565217391305
1979	10.869565217391305
1980	10.869565217391305
1981	10.869565217391305
1982	13.043478260869565
1983	13.043478260869565
1984	13.043478260869565
1985	13.043478260869565
1986	13.043478260869565
1987	13.043478260869565
1988	10.869565217391305
1989	10.869565217391305
1990	8.695652173913043
1991	8.695652173913043
1992	8.695652173913043
1993	8.695652173913043
1994	8.695652173913043
1995	8.695652173913043
1996	8.695652173913043
1997	8.695652173913043
1998	8.695652173913043
1999	8.695652173913043
2000	8.695652173913043
2001	8.695652173913043
2002	8.695652173913043
2003	8.695652173913043
2004	8.695652173913043
2005	8.695652173913043
2006	8.695652173913043
2007	6.521739130434782
2008	6.521739130434782
2009	6.304347826086956
2010	5.217391304347826
2011	3.260869565217391
2012	3.260869565217391
2013	3.369565217391304
2014	3.369565217391304
2015	3.369565217391304
2016	3.369565217391304
2017	3.369565217391304
2018	3.369565217391304
2019	3.369565217391304
2020	3.369565217391304
2021	3.369565217391304