Year	% of land area
1961	1.0555378814133056
1962	1.105323382170178
1963	1.0671434453385518
1964	1.0931967521095125
1965	1.0920125108926506
1966	1.0907809000271145
1967	1.0838175616719667
1968	1.1075023860092037
1969	1.1266870937223656
1970	1.145208626354085
1971	1.1656723145814578
1972	1.1795989912917533
1973	1.2068879108181931
1974	1.2301488163163141
1975	1.2540244317099307
1976	1.2656774370436912
1977	1.3000206438200181
1978	1.3077893140425252
1979	1.3309532148889027
1980	1.3626437050038858
1981	1.3865181549559806
1982	1.4022449751625192
1983	1.3390930536809882
1984	1.3651325679248094
1985	1.3940408422124415
1986	1.419021121978548
1987	1.4533579729644686
1988	1.4829282688006724
1989	1.4979649849072316
1990	1.5195159930517366
1991	1.5513130929623817
1992	1.5643262963519131
1993	1.6093711862184943
1994	1.6372764044995953
1995	1.6706772896071083
1996	1.7108208222194918
1997	1.7339307363668222
1998	1.7611973823363847
1999	1.80154118282435
2000	1.8323245263883643
2001	1.876549846616517
2002	1.9005359489438065
2003	1.9434739394878628
2004	2.001234006616155
2005	2.073174200995956
2006	2.117202376774124
2007	2.166211541381829
2008	2.2090135038158962
2009	2.24503016885443
2010	2.3212389054669256
2011	2.3482078974777267
2012	2.3811474525903082
2013	2.4248762977219904
2014	2.4491652700543813
2015	2.5203056287065144
2016	2.52177183849358
2017	2.545308041039486
2018	2.6122781096689622
2019	2.6392898247197776
2020	2.64850784100462
2021	2.680058014520537