Year	% of land area
1961	1.1195512962063332
1962	1.1416331758159255
1963	1.1504659276597624
1964	1.2145033785275803
1965	1.2145033785275803
1966	1.2078788146447026
1967	1.2542507618248466
1968	1.296206333083072
1969	1.3403700923022568
1970	1.3779092876385637
1971	1.4309057987015854
1972	1.452987678311178
1973	1.4949432495694033
1974	1.5545643245153027
1975	1.6031444596564062
1976	1.6451000309146313
1977	1.6738064744071017
1978	1.7290111734310825
1979	1.7510930530406748
1980	1.759925804884512
1981	1.7731749326502673
1982	1.7555094289625934
1983	1.7488848650797157
1984	1.7820076844941042
1985	1.828379631674248
1986	1.8902088945811066
1987	1.903458022346862
1988	1.9586627213708432
1989	2.0006182926290688
1990	2.049198427770172
1991	2.060239367574968
1992	2.080113059223601
1993	2.144150510091419
1994	2.1596078258181337
1995	2.1949388331934814
1996	2.243518968334585
1997	2.258976284061299
1998	2.349511990460628
1999	2.3870511857969348
2000	2.40250850152365
2001	2.413549441328446
2002	2.4356313209380382
2003	2.4466722607428344
2004	2.4797950801572233
2005	2.5018769597668156
2006	2.5416243430640817
2007	2.676323808682595
2008	2.7491940113942497
2009	2.797774146535353
2010	2.797774146535353
2011	2.8397297177935785
2012	2.8397297177935785
2013	2.8397297177935785
2014	2.8816852890518043
2015	2.9192244843881108
2016	2.9324736121538666
2017	3.1025040851477277
2018	3.1025040851477277
2019	3.1002958971867685
2020	3.1312105286401977
2021	3.1819988517422604