Year	base year varies by country
1960	9.300845833186372
1961	8.654731885857267
1962	8.716654470369605
1963	8.99340096274481
1964	9.124690112559247
1965	8.912625700466846
1966	9.424010647970816
1967	9.58875077697451
1968	9.594594681986592
1969	10.058834998002748
1970	9.89575609447224
1971	11.12216058580243
1972	11.08074692185784
1973	11.428058991017927
1974	16.231509969302245
1975	15.53942512498521
1976	17.7475796265722
1977	21.41376914919581
1978	18.778979048275378
1979	20.19622836072301
1980	22.309910400306183
1981	25.13153897781923
1982	26.912550301017387
1983	30.75031326881389
1984	31.32824858609523
1985	32.39385933488386
1986	34.206230956555856
1987	34.77365817259049
1988	35.67282723733867
1989	36.02682815917758
1990	37.09896654964726
1991	38.08991438389967
1992	39.32609764686777
1993	36.1026264953968
1994	49.04266756379813
1995	54.4786600029025
1996	57.41393087436924
1997	58.5828983385637
1998	64.18145062303961
1999	64.89715543775122
2000	71.41896699792599
2001	72.58599111072324
2002	76.23550990456653
2003	74.02993503907314
2004	72.61752607579098
2005	76.88464647067505
2006	76.49348565990525
2007	80.29046330837848
2008	87.57617965677218
2009	90.30613056361614
2010	90.22184244143966
2011	92.76573305430267
2012	94.38949751866652
2013	95.97833318017608
2014	96.43890995124968
2015	98.5631806922436
2016	100
2017	99.11504846642238
2018	99.56529068842919
2019	99.57718231269087
2020	101.50212238619292
2021	104.00553770796144
2022	108.32781352157738
2023	111.13844938019675