Year	base year varies by country
1960	15.473644425781155
1961	16.28818607109086
1962	16.41176675981314
1963	17.183032868515458
1964	18.67417452824738
1965	19.3038303867583
1966	20.458834252206103
1967	21.319663983183474
1968	22.214378314726506
1969	23.638313696824216
1970	24.97267186618405
1971	27.167777380223846
1972	29.385108141498918
1973	31.877259436590833
1974	35.988040343764204
1975	38.90141182483377
1976	42.39990729168003
1977	44.66603513768514
1978	47.048918465704396
1979	49.293650722847495
1980	52.362363595373054
1981	55.7083670181609
1982	58.28412964611922
1983	59.09373863012092
1984	60.45709525409778
1985	60.98058315188628
1986	61.10967927080999
1987	60.469473187911746
1988	60.96510399569578
1989	61.78695536092804
1990	62.7506782061062
1991	64.7066479329925
1992	66.32155812423126
1993	67.38105073710616
1994	68.77094226765075
1995	70.19080330062036
1996	70.920952186834
1997	72.79524536424626
1998	74.30992054919253
1999	75.26359177384099
2000	77.83788495313765
2001	81.09528749544194
2002	84.15301882500565
2003	85.97937438623316
2004	87.0146009594895
2005	88.74509509539004
2006	91.01795139151915
2007	92.90403059553581
2008	95.04669994223927
2009	95.25646953987477
2010	96.15227445986633
2011	96.33847534588696
2012	97.73163525419079
2013	98.98258753336233
2014	99.23319732216595
2015	100
2016	100.45466728877331
2017	101.72110646991415
2018	104.20014214161282
2019	107.36025506416087
2020	109.4307749000305
2021	112.63109309723856
2022	118.86547632484809
2023	128.0839015040661