Year	base year varies by country
1960	0.0022652422379291623
1961	0.002182428792943367
1962	0.0022280756506442402
1963	0.002237068165250069
1964	0.0023284100115417176
1965	0.002574966628959032
1966	0.0031837364181669494
1967	0.0031921056480565986
1968	0.0037009242700321962
1969	0.004550146117063203
1970	0.00403168400654715
1971	0.0037294478573448833
1972	0.0038678294292137836
1973	0.0046371347997566734
1974	0.005138972468943367
1975	0.004410785281815885
1976	0.0050814269666009035
1977	0.005500848884774612
1978	0.006198438370829194
1979	0.007555218697738385
1980	0.008443932700301875
1981	0.009048401588592358
1982	0.009603846885473496
1983	0.011392980784865421
1984	0.013481454501358276
1985	0.019027367693162826
1986	0.03462759378793703
1987	0.05610116829512249
1988	0.07545063203924496
1989	0.13647309226989712
1990	0.2816653412855241
1991	0.5426411752133568
1992	1.440896567533792
1993	3.5108646814534636
1994	6.345614016745234
1995	8.288077840172148
1996	10.306163425971247
1997	12.924190842490432
1998	15.10926735044589
1999	17.817433251595492
2000	23.62838786078456
2001	29.61375586026077
2002	35.35613653558318
2003	41.58154736210371
2004	49.78010754163995
2005	58.06859454602036
2006	66.51307629027808
2007	75.1399624505151
2008	83.13503841070393
2009	87.75708521987204
2010	100
2011	111.10741330686038
2012	118.87629610829713
2013	130.44401918009808
2014	137.54085808146093
2015	146.7001055966209
2016	166.61626034618865
2017	183.39924481086757
2018	196.99200995891454
2019	212.02933688859872
2020	241.5308245036261
2021	302.25838256934213
2022	320.70096406099475
2023	349.19550947794613