Year	% of land area
1961	1.1944982922551464
1962	1.1963445029077817
1963	1.2037293455183236
1964	1.2378842425920797
1965	1.2692698236868827
1966	1.3052709314132742
1967	1.3366565125080772
1968	1.3735807255607866
1969	1.409581833287178
1970	1.4437367303609343
1971	1.468660574171513
1972	1.5083541032031755
1973	1.5489707375611557
1974	1.579433213329641
1975	1.6172805317086678
1976	1.6680513246561433
1977	1.7031293270562173
1978	1.7326686974983845
1979	1.7631311732668697
1980	1.7935936490353548
1981	1.827748546109111
1982	1.862826548509185
1983	1.8932890242776703
1984	1.9320594479830149
1985	1.8923659189513522
1986	1.9015969722145296
1987	1.910828025477707
1988	1.9200590787408842
1989	1.9292901320040616
1990	1.938521185267239
1991	1.9477522385304165
1992	1.9846764515831254
1993	2.0308317178990123
1994	2.1692975168466724
1995	2.4000738484261057
1996	2.4831533277947013
1997	2.651158497184529
1998	2.7453152404689374
1999	2.83393335179544
2000	2.902243145942952
2001	2.9077817779008583
2002	3.0462475768485184
2003	3.2437921166805133
2004	3.303793962891166
2005	3.5133388719652916
2006	3.5922643773654577
2007	3.6711898827656233
2008	3.7501153881657894
2009	3.8290408935659563
2010	3.907966398966122
2011	3.9924305363241945
2012	4.077817779008585
2013	4.163205021692975
2014	4.168598541493584
2015	4.158437551924675
2016	4.189265300470783
2017	4.084322440690483
2018	4.271761561894212
2019	4.377754915535863
2020	4.390911197267608
2021	4.494015692790548