Year	base year varies by country
1964	16.797911039992872
1965	16.81621186588788
1966	17.256796855590924
1967	17.930925222767428
1968	18.424001610225243
1969	18.89194761330916
1970	19.25296844755363
1971	21.387994805081938
1972	21.850560521696764
1973	22.61843281121364
1974	26.376024970650757
1975	30.028042746193506
1976	20.145833290022672
1977	32.3736244803076
1978	33.86325374601508
1979	36.65247072901164
1980	40.403303695139506
1981	44.198189771616384
1982	47.25173988753202
1983	48.60890047299806
1984	48.86520606237557
1985	50.077491773361736
1986	50.506732185225346
1987	50.71205165148124
1988	51.8785358138269
1989	53.24283244893252
1990	54.84753082227092
1991	57.57653988516282
1992	58.30395872663049
1993	59.23050401073539
1994	60.83885592375265
1995	68.30380123549547
1996	63.134164372782564
1997	63.768510521842956
1998	65.45384872524136
1999	65.05979972511625
2000	66.83432750618927
2001	68.31943845227397
2002	69.63702108490742
2003	70.77444748080308
2004	70.67240272284063
2005	73.73233685590874
2006	76.85753706503995
2007	78.98469090864617
2008	83.53843986029426
2009	87.00619296005104
2010	88.26596474954407
2011	88.76057131616845
2012	90.00640589340944
2013	91.4621640197617
2014	92.82549798274022
2015	95.99780106908548
2016	99.96194176449256
2017	100.00012566934635
2018	110.75339985264183
2019	104.3517027891486
2020	120.14422283082145
2021	104.4664199224169
2022	107.75232546782266
2023	118.90079494675132