Year	base year varies by country
1960	0.24451064999634736
1961	0.26085575116311915
1962	0.2828231325360615
1963	0.28747814124826565
1964	0.29342244038225707
1965	0.3002252266047517
1966	0.30916223322058056
1967	0.29952912452976715
1968	0.301083511880179
1969	0.3090314889476599
1970	0.31293873208217904
1971	0.3314045595618455
1972	0.3596506665963977
1973	0.4338864885129603
1974	0.5362295715969153
1975	0.5688092332268622
1976	0.59463605574389
1977	0.6567662398336043
1978	0.7173027674306769
1979	0.8558947457396471
1980	0.9974164679317828
1981	1.1552693276947101
1982	1.2185159026710837
1983	1.4123552301122486
1984	1.8197079384893036
1985	2.295221827088086
1986	2.9125618499246504
1987	3.7271782631176755
1988	4.742294692824059
1989	6.233979675644034
1990	8.516085738326428
1991	10.655312596167319
1992	12.155891812489116
1993	13.641346041461683
1994	15.356523012528983
1995	17.057477102624983
1996	19.005688020281347
1997	19.653969993767227
1998	22.849425707646848
1999	25.28977360028858
2000	28.998393826354636
2001	33.03949535722545
2002	38.96988131991517
2003	44.87160666309342
2004	50.18216365567378
2005	56.68217105261321
2006	61.70184926562477
2007	69.49818991147481
2008	77.99417339594561
2009	80.83937348014736
2010	84.60301330886968
2011	88.91413797415615
2012	93.18048360928105
2013	97.22235117215337
2014	100.00000004972969
2015	101.60388806090694
2016	105.80495933781282
2017	108.08950985096311
2018	110.2083325205468
2019	113.58277881123225
2020	116.08605405716104
2021	125.89315020326586
2022	136.0331642620255
2023	138.84735757133996