Year	base year varies by country
1960	0.8956028650224256
1961	0.961833205986752
1962	0.8894945385246452
1963	1.0081221084999017
1964	1.17854554039068
1965	1.2883933365330906
1966	1.7940750513378976
1967	2.386699393131033
1968	2.423409115618592
1969	2.3745356419493215
1970	2.6060658940751016
1971	2.6499258456875814
1972	2.722682261081176
1973	2.7980118619353926
1974	3.3620900430368525
1975	6.297453091292381
1976	6.199440034566668
1977	6.681599800630039
1978	7.352985161843704
1979	7.397643626783415
1980	8.28565048289117
1981	8.852103323206958
1982	9.292027669691509
1983	9.042796174995617
1984	10.754195536331407
1985	11.798958810572174
1986	10.50480744381956
1987	11.3066159458522
1988	11.103932995031691
1989	11.744101772692424
1990	13.008851259572527
1991	13.428020301853943
1992	14.941723396909026
1993	16.675911844694085
1994	20.2135856030572
1995	29.10261993939349
1996	33.03279299410475
1997	36.191780474653406
1998	37.38930566205128
1999	36.06806003041832
2000	36.28880568526666
2001	36.86077907451736
2002	35.1514346491981
2003	43.21984886510023
2004	47.470806608286026
2005	51.72318274360909
2006	50.94133864634095
2007	57.13281447095029
2008	69.33467868892077
2009	73.24125726066704
2010	76.06098415071241
2011	80.20268171696787
2012	84.14682210373734
2013	86.07167155917011
2014	89.09762851300903
2015	88.70247401550682
2016	93.31151316333715
2017	100
2018	100.80060430069071
2019	103.4583009285236
2020	111.1687195341292
2021	114.39821014274149
2022	134.4029612969257
2023	149.1149360874937