Year	base year varies by country
1960	0.11841774703410775
1961	0.12478763666283312
1962	0.12552911700975808
1963	0.13165482711450693
1964	0.13532838004159425
1965	0.13203409440391384
1966	0.13563746688516623
1967	0.134032210463006
1968	0.13522487854251206
1969	0.13755622845445453
1970	0.14239888962447964
1971	0.14662890233881387
1972	0.15583065417177533
1973	0.17210799938447535
1974	0.2057333675418303
1975	0.2351599843487253
1976	0.2923888026692446
1977	0.3454889991901266
1978	0.3771354812433875
1979	0.4149907260024818
1980	0.46889104843323626
1981	0.5520460220797311
1982	0.6570413845031587
1983	0.7987750764351262
1984	0.9620728665749763
1985	1.2894221442593568
1986	1.6177108192735372
1987	2.189532273407633
1988	2.985959091683672
1989	3.601088878914442
1990	4.409504007983954
1991	5.649130423880652
1992	7.082624448158518
1993	8.815175072486978
1994	11.562861111792474
1995	14.66887123904245
1996	17.50196654582468
1997	21.105137028948576
1998	24.10673359817156
1999	26.888650655405232
2000	29.093816926303617
2001	30.49496619302271
2002	32.70067645341715
2003	35.45364262628238
2004	37.89484684354638
2005	40.33004644758751
2006	42.55227043634148
2007	46.42426727617659
2008	54.02891258719625
2009	58.91402449092956
2010	64.46886069337955
2011	72.33304494564676
2012	79.91636470284284
2013	87.64122722385027
2014	92.94426281870534
2015	100.00000014806677
2016	107.47203382672765
2017	110.30727927275292
2018	113.6621232110697
2019	116.25408441882222
2020	123.72110052543925
2021	127.02977796728874
2022	130.53912145621257
2023	134.1913823501191