Year	% of land area
1961	1.287001287001287
1962	1.287001287001287
1963	1.287001287001287
1964	1.287001287001287
1965	1.3789299503585217
1966	1.3789299503585217
1967	1.3789299503585217
1968	1.3789299503585217
1969	1.3789299503585217
1970	1.3789299503585217
1971	1.4708586137157567
1972	1.4708586137157567
1973	1.4708586137157567
1974	1.4708586137157567
1975	1.4708586137157567
1976	1.4708586137157567
1977	1.4708586137157567
1978	1.4708586137157567
1979	1.4708586137157567
1980	1.5627872770729916
1981	1.5627872770729916
1982	1.5627872770729916
1983	1.5627872770729916
1984	1.5627872770729916
1985	1.654715940430226
1986	1.654715940430226
1987	1.654715940430226
1988	1.654715940430226
1989	1.654715940430226
1990	1.654715940430226
1991	1.746644603787461
1992	1.746644603787461
1993	1.8385732671446955
1994	1.8385732671446955
1995	1.8385732671446955
1996	1.8385732671446955
1997	2.2062879205736348
1998	2.2062879205736348
1999	2.2062879205736348
2000	2.390145247288104
2001	2.390145247288104
2002	2.390145247288104
2003	2.390145247288104
2004	2.390145247288104
2005	2.7578599007170435
2006	3.309431880860452
2007	3.4013605442176873
2008	3.769075197646626
2009	3.769075197646626
2010	3.769075197646626
2011	3.769075197646626
2012	3.677146534289391
2013	3.125574554145983
2014	3.125574554145983
2015	3.125574554145983
2016	3.125574554145983
2017	3.125574554145983
2018	3.125574554145983
2019	3.125574554145983
2020	3.125574554145983
2021	3.125574554145983