Year	base year varies by country
1960	0.0008511554701833196
1961	0.0009244343705368933
1962	0.001006801871276887
1963	0.0010842401255963718
1964	0.0011432562074040337
1965	0.0011283039664537415
1966	0.0012268141873653115
1967	0.0012061033125139776
1968	0.0011892263749384829
1969	0.0012082095515328144
1970	0.0013241764499801335
1971	0.001515254106989046
1972	0.0017666506051079306
1973	0.0021598437732538774
1974	0.0029264175161481387
1975	0.00399649178135759
1976	0.005250268620591836
1977	0.007432558349287329
1978	0.011605081009204302
1979	0.0205250214778339
1980	0.04625711000216581
1981	0.10390305512087053
1982	0.23611379356651596
1983	0.5900979129109895
1984	2.8606194116812187
1985	10.428007773783223
1986	15.658689285533493
1987	18.81843618680352
1988	22.425032327820933
1989	26.619156303821523
1990	30.860137685903748
1991	37.072212398891224
1992	41.54242712136135
1993	46.14958521291556
1994	51.9357875956919
1995	56.64596840841784
1996	61.87375508812429
1997	66.87692581565791
1998	71.47679481762046
1999	75.89841892388208
2000	77.38640660194575
2001	78.73890551326227
2002	82.48673361898102
2003	82.09976660920518
2004	82.20430933558038
2005	83.05664198424955
2006	84.25860424252865
2007	84.98306887980303
2008	86.13463767223173
2009	89.94110972377877
2010	91.00911775794751
2011	92.3455641911937
2012	95.36513356935798
2013	97.08506774329283
2014	97.7347546504714
2015	100
2016	100.3578807362184
2017	100.32389310173005
2018	101.11038312986574
2019	102.96724518238216
2020	104.03956504819118
2021	106.25383361490826
2022	111.16627477279889
2023	115.5516879709104