Year	base year varies by country
1966	0.8457949317638525
1967	0.918107987994454
1968	0.8383609891551725
1969	0.8981233083735342
1970	0.9795753382899728
1971	1.0301543234137347
1972	1.0626740153326053
1973	1.0515636714167704
1974	1.2717319247520045
1975	1.4376749595973675
1976	1.6057850386576165
1977	1.9686186198964488
1978	2.0957984187297534
1979	2.3178889903543127
1980	2.313772775275286
1981	2.349949234406453
1982	2.690396212260978
1983	2.7625820199364313
1984	3.011258778486047
1985	4.198270202006178
1986	5.899274485519066
1987	6.990522981763833
1988	7.669033587159274
1989	8.722495939827505
1990	9.766101879168056
1991	22.856181729624588
1992	23.30188432146091
1993	24.500142358200648
1994	25.42560989074153
1995	26.433290501894014
1996	28.645378805938204
1997	26.935501927746934
1998	28.39320313221801
1999	27.701688270257275
2000	28.315829882642817
2001	28.827054536716613
2002	31.822573108719087
2003	35.92575696800499
2004	69.76426846097114
2005	72.63423462226599
2006	73.58080687152743
2007	76.82927065633456
2008	78.73144497932259
2009	82.28483550006581
2010	86.92926386409718
2011	90.90377716881355
2012	94.3991730412781
2013	100
2014	105.21172310682789
2015	115.43868390824292
2016	124.46670788266671
2017	129.34794194140392
2018	138.3399056531053
2019	146.98920208731425
2020	150.20644141612425
2021	161.29486549212555
2022	175.2344153970356
2023	197.87895255294123