Year	base year varies by country
1961	0.24538664496715182
1962	0.25631908523936203
1963	0.26531127576136915
1964	0.2622027939045262
1965	0.2730143639208357
1966	0.2924222812690991
1967	0.29458605797626225
1968	0.28768503762613545
1969	0.29160238040453246
1970	0.27010642142922325
1971	0.3224305758134781
1972	0.3371241849740927
1973	0.36295202206745225
1974	0.49732577391624333
1975	0.5079052844797396
1976	0.5317437040733067
1977	0.5648891420284748
1978	0.6293673856111477
1979	0.7376365293258867
1980	0.8533157622565547
1981	0.9520016506170073
1982	1.003348724315469
1983	1.141802764296646
1984	1.25164846560754
1985	1.3988828481316176
1986	1.5807830670479892
1987	2.07365817988554
1988	2.570750707549731
1989	4.55994151825975
1990	6.321355143003688
1991	8.134790302782758
1992	10.39280188832754
1993	14.320208459841947
1994	23.45661765162016
1995	35.202323006878736
1996	72.57111241526684
1997	100.00268181379784
1998	128.45213955336052
1999	152.11940065410724
2000	178.20418413003546
2001	200.93641018086208
2002	259.2378109529096
2003	339.3752829400836
2004	420.0800806410184
2005	492.9749444699447
2006	561.9828152940081
2007	644.8761423780284
2008	809.9207633027937
2009	1039.5233195583091
2010	1306.3912975682922
2011	1633.5355222398168
2012	1915.2490440554511
2013	2865.2004776713966
2014	4641.135411163524