Year	base year varies by country
1960	23.68092433967083
1961	25.524654237649553
1962	26.596581891735294
1963	28.062178307669843
1964	29.55752925420753
1965	31.07585734886168
1966	32.620597553998834
1967	34.41322663474104
1968	36.10596616934249
1969	37.706687605813805
1970	44.26630623785337
1971	46.520059677933055
1972	49.12723996012523
1973	55.369050419614126
1974	66.89137773113944
1975	71.69246680344595
1976	77.43351816361044
1977	82.65958887216837
1978	86.4650365477354
1979	88.84423532337317
1980	93.67557053307533
1981	96.35250189554154
1982	98.04784638042163
1983	98.95062249898126
1984	100.36522642713453
1985	101.63045114534926
1986	103.26876131584154
1987	103.09962187324093
1988	103.72831231821269
1989	105.87449284707455
1990	108.58954272380228
1991	111.74360307639436
1992	113.61784455090667
1993	114.21821333305458
1994	114.43158281177033
1995	113.83258041136412
1996	113.32514277839773
1997	113.89682371643461
1998	113.86643576251343
1999	112.45329482740287
2000	110.95062632874873
2001	109.74694534230969
2002	108.22038880158954
2003	106.48052559854221
2004	105.28286842422354
2005	104.02577236063308
2006	103.12905107334794
2007	102.40174009505539
2008	101.4683172183579
2009	100.89038927387557
2010	98.99290139934487
2011	97.3871570967524
2012	96.65081950261349
2013	96.30831310849044
2014	97.93235517118036
2015	100
2016	100.41994437605727
2017	100.34528264576868
2018	100.34504431931272
2019	100.98203783727084
2020	101.93273293034582
2021	101.73899894120024
2022	102.0787867249507
2023	105.90940785495597