Year	% of land area
1961	3.842902159711014
1962	3.842902159711014
1963	3.842902159711014
1964	3.842902159711014
1965	3.842902159711014
1966	3.7331049551478417
1967	3.2939161368951546
1968	3.2939161368951546
1969	3.4037133414583267
1970	3.4586119437399123
1971	3.4586119437399123
1972	3.4586119437399123
1973	3.4586119437399123
1974	3.4586119437399123
1975	3.4586119437399123
1976	3.4586119437399123
1977	3.5135105460214984
1978	3.5135105460214984
1979	3.7331049551478417
1980	3.842902159711014
1981	3.842902159711014
1982	3.842902159711014
1983	3.842902159711014
1984	4.062496568837357
1985	4.282090977963701
1986	4.3918881825268725
1987	4.3918881825268725
1988	4.3918881825268725
1989	4.3918881825268725
1990	4.3918881825268725
1991	4.721279796216389
1992	4.83107700077956
1993	5.270265819032248
1994	5.38006302359542
1995	5.709454637284934
1996	5.709454637284934
1997	5.819251841848107
1998	5.874150444129692
1999	6.03884625097445
2000	6.368237864663966
2001	6.587832273790309
2002	6.697629478353481
2003	6.807426682916653
2004	6.917223887479825
2005	7.027021092042997
2006	7.027021092042997
2007	7.027021092042997
2008	7.136818296606168
2009	7.136818296606168
2010	7.136818296606168
2011	7.136818296606168
2012	7.136818296606168
2013	7.136818296606168
2014	7.136818296606168
2015	7.136818296606168
2016	7.136818296606168
2017	7.24661550116934
2018	7.24661550116934
2019	7.24661550116934
2020	7.24661550116934
2021	7.24661550116934