Year	% of land area
1961	1.0788855746652282
1962	1.100040193776311
1963	1.100040193776311
1964	1.121194812887394
1965	1.1423494319984768
1966	1.1635040511095598
1967	1.2058132893317257
1968	1.2058132893317257
1969	1.2058132893317257
1970	1.222736984620592
1971	1.222736984620592
1972	1.3644729326648473
1973	1.5019779568868863
1974	1.6500602906644666
1975	1.7875653148865054
1976	1.9250703391085442
1977	2.0689217490639082
1978	2.1831566922637555
1979	2.1450783778638063
1980	2.1577711493304563
1981	2.2212350066637048
1982	2.3270081022191196
1983	2.432781197774534
1984	2.5385542933299488
1985	2.644327388885363
1986	2.7501004844407775
1987	2.707791246218612
1988	2.686636627107529
1989	2.644327388885363
1990	2.602018150663197
1991	2.5385542933299488
1992	2.5385542933299488
1993	2.5385542933299488
1994	2.5385542933299488
1995	2.5385542933299488
1996	2.5385542933299488
1997	2.5385542933299488
1998	2.5385542933299488
1999	2.5385542933299488
2000	2.5385542933299488
2001	2.5385542933299488
2002	2.5385542933299488
2003	2.5385542933299488
2004	2.644327388885363
2005	2.644327388885363
2006	2.644327388885363
2007	2.644327388885363
2008	2.7501004844407775
2009	2.8558735799961923
2010	3.173192866662436
2011	3.27896596221785
2012	3.27896596221785
2013	3.27896596221785
2014	3.27896596221785
2015	3.27896596221785
2016	3.27896596221785
2017	3.27896596221785
2018	3.27896596221785
2019	3.27896596221785
2020	3.27896596221785
2021	3.27896596221785