Year	base year varies by country
1960	7.298689765911141
1961	7.636985388575878
1962	8.010338272603596
1963	8.384779588749055
1964	9.017157237951862
1965	9.471544298078996
1966	9.895434838051518
1967	9.818802885704748
1968	11.406739067755886
1969	10.967273033216292
1970	11.459800071473516
1971	12.025715744426234
1972	12.584218495265183
1973	12.861007155669322
1974	13.553057912755692
1975	16.172351188637546
1976	20.376616993004482
1977	22.693940184635554
1978	24.788226331384898
1979	27.49674509203529
1980	32.519129842869255
1981	37.030426144108766
1982	44.77505613722027
1983	49.7463774972253
1984	50.45247810919966
1985	67.67956522875134
1986	65.35880774120638
1987	63.853364870052566
1988	65.52891288391363
1989	67.13843718766097
1990	68.37153200827595
1991	68.10500910539295
1992	70.00013111339624
1993	67.59701238988275
1994	84.09918014261639
1995	92.42329669016213
1996	89.14869702052603
1997	89.88273045411773
1998	89.51047744526005
1999	93.16672578242333
2000	101.09204748249023
2001	101.52263761007691
2002	99.11464074141011
2003	100.43922726673127
2004	95.97994057794175
2005	100
2006	103.33404593869069
2007	105.23356507679871
2008	112.68101890226436
2009	113.48288902376396
2010	118.26200449558529
2011	123.00326432464668
2012	130.6061405913532
2013	133.85495106929767
2014	149.77539565903683
2015	153.83170744431112
2016	158.41606782421715
2017	168.6239339474842
2018	166.55977943876778
2019	170.43701969728423
2020	173.8153550750193
2021	179.3527063749787
2022	190.05634039024199
2023	196.51816661816017