Year	base year varies by country
1970	16.938067319045434
1971	18.008532218799914
1972	19.02001118728687
1973	20.32082218953667
1974	22.453816305241915
1975	24.999910506034677
1976	27.55068241503596
1977	29.446387774440584
1978	30.813414669251475
1979	32.72664243409528
1980	35.37018539629375
1981	38.08517229048499
1982	41.66109796825446
1983	45.11654382947523
1984	48.074751771109256
1985	49.01577444589072
1986	49.58760757682208
1987	50.2078392065859
1988	51.11371069767351
1989	52.953565375985626
1990	55.17781885501994
1991	57.061788381747924
1992	59.657326211813746
1993	61.776137010734914
1994	63.249849407400994
1995	64.50042825297366
1996	65.78189398821249
1997	67.1348549614864
1998	67.74651781697781
1999	69.73276394197669
2000	72.07287424406448
2001	73.97626861983402
2002	75.48915198738415
2003	77.58874058031824
2004	79.65222945082725
2005	82.69430039964749
2006	84.69319024037738
2007	86.86974660427451
2008	89.32382552321513
2009	89.53244545676885
2010	91.08779093497273
2011	93.53448462383086
2012	95.80096007825539
2013	97.20157012368549
2014	98.31333192579994
2015	100
2016	100.78497242065245
2017	102.97835783835151
2018	104.72778130722114
2019	106.89640701721895
2020	109.33758308113062
2021	111.62900494980804
2022	119.42812390676714
2023	125.08825775147201