Year	base year varies by country
1960	0.8954858304553359
1961	0.9000957345639943
1962	0.9128535471383434
1963	0.9484581084843559
1964	0.9773073261136314
1965	1.0134614350499203
1966	1.0526537130254068
1967	1.1023635763831805
1968	1.133046961105426
1969	1.197829852599928
1970	1.2608093932635773
1971	1.3610642943605604
1972	1.4639692874967967
1973	1.6027251998234688
1974	1.8344920831178633
1975	2.135690137600694
1976	2.3958771002144394
1977	2.6402826233505103
1978	2.895277151291533
1979	3.273505208459563
1980	3.8669753536363283
1981	4.507204966657608
1982	5.060563246786431
1983	5.727765382311925
1984	6.401221754559197
1985	7.431361852143257
1986	8.85021641583608
1987	10.013632719816197
1988	11.705194378025077
1989	13.712777338730922
1990	15.855740814706188
1991	18.152114924027003
1992	20.338478875677033
1993	22.401897515617353
1994	24.86202247874891
1995	27.17400714587334
1996	29.378214532730144
1997	31.830719672768353
1998	34.180768644417874
1999	36.92112630352544
2000	39.94680403611775
2001	42.62044691649359
2002	46.70576677723967
2003	48.82985272360955
2004	52.02308833262905
2005	54.37535132324376
2006	56.896407316308505
2007	61.205982055190745
2008	67.45020862992692
2009	72.25627955057273
2010	75.78134819491522
2011	79.88259538819716
2012	84.75742003871436
2013	90.07415429754063
2014	95.4635385808977
2015	99.99999971640622
2016	106.58640656249155
2017	111.21203328526079
2018	115.87243656180502
2019	120.16642033307488
2020	124.04162760681344
2021	129.83205965568834
2022	138.86638122388803
2023	147.6894559696971