Year	base year varies by country
1960	5.242171290970283
1961	5.507658387100121
1962	5.678944308575512
1963	5.663945136210517
1964	5.914350038287462
1965	6.07713848437016
1966	6.0885863981444395
1967	7.52726974703598
1968	7.960142700258781
1969	8.382186393760032
1970	9.043038250627562
1971	9.354130041853715
1972	10.10025132310368
1973	10.759750570343819
1974	11.906319582764622
1975	12.619516796472618
1976	15.102336500249086
1977	15.99107484688711
1978	16.53633957791998
1979	18.661716732865848
1980	21.320245237800723
1981	23.1964681429764
1982	26.091840035415675
1983	29.421960347118954
1984	33.40928084237692
1985	37.146819815148504
1986	37.213400171683105
1987	36.323140595718655
1988	36.618774152243795
1989	35.95264819700426
1990	36.5433855954016
1991	37.84751434130896
1992	37.363947615239354
1993	58.19635835586895
1994	61.61974304313493
1995	65.70791354496211
1996	65.97768335063846
1997	70.04442309051325
1998	70.79100549763623
1999	72.33976297540927
2000	73.44769198953729
2001	75.26137911933296
2002	77.34950070146327
2003	78.86007027699469
2004	78.97007048155153
2005	80.04180644314054
2006	81.88250783774188
2007	82.2843118827204
2008	86.34959860152216
2009	89.46121949860813
2010	90.0768800552929
2011	92.40901033667296
2012	94.20385701935612
2013	97.08033332930115
2014	99.03573766468212
2015	99.34254213799586
2016	100
2017	101.02514116066253
2018	102.94157962526324
2019	104.14576121387182
2020	104.88058458336518
2021	107.9000248934675
2022	113.65823057488087
2023	116.75656479544077