Year	base year varies by country
1960	0.0069105300064241735
1961	0.007141386661969273
1962	0.007359656516051163
1963	0.0074704574169736195
1964	0.007844558185808018
1965	0.006087311740250952
1966	0.00635856033137011
1967	0.006608372643475207
1968	0.006687587553929327
1969	0.0071874782583943204
1970	0.007545961977844078
1971	0.008031905605128616
1972	0.008501031934664192
1973	0.009564350671069631
1974	0.011680205450230392
1975	0.013715154258164821
1976	0.016378586214746815
1977	0.02174678038624064
1978	0.025371408788603816
1979	0.030253813154166143
1980	0.04013121331864584
1981	0.05015654650992484
1982	0.08151399174321552
1983	0.15756544194905356
1984	0.25432073397253857
1985	0.40251472005730776
1986	0.7223082244464326
1987	1.708775812958212
1988	3.7319419396058047
1989	4.735228581120059
1990	6.034874983383142
1991	7.487752774823574
1992	8.54281061022011
1993	12.2466709638846
1994	12.982005045110695
1995	17.80084381262956
1996	22.831920660553198
1997	27.011373273077037
1998	31.553600272301637
1999	35.65762856075915
2000	39.500703328451294
2001	41.495737585447706
2002	43.53082847994821
2003	46.04263042758025
2004	49.88441477175339
2005	53.31192544758836
2006	55.662983745726926
2007	59.16109480877463
2008	63.481660039524556
2009	66.84336978928165
2010	70.75472741560411
2011	73.49882133577987
2012	77.38379503152318
2013	78.84930159139648
2014	82.48185318635286
2015	84.91366067316606
2016	90.18083164352683
2017	95.4349057371817
2018	100
2019	103.07833217236899
2020	108.74151110989038
2021	114.79312344449698
2022	124.45896941144734
2023	127.31121141663965