Year	base year varies by country
1970	40.91188532533557
1971	42.43586518755783
1972	44.87703904548145
1973	51.28437343955099
1974	63.18395510642579
1975	67.41399655528781
1976	72.58497664202078
1977	77.2112590429573
1978	80.14949017202309
1979	84.09062734923495
1980	90.48855370278652
1981	93.07885569809446
1982	94.87844956488264
1983	96.37057436131052
1984	97.54949959579615
1985	97.86624145307844
1986	98.18782284676709
1987	98.6170073039678
1988	98.67177304325003
1989	100.32175652376256
1990	102.69113157801814
1991	105.7545693371821
1992	107.63217395604332
1993	107.62478651563205
1994	108.1437269848835
1995	107.65025054723118
1996	107.60238937988854
1997	108.54111487536728
1998	108.1193245044204
1999	106.95890319911021
2000	106.1169269175793
2001	104.94606920683924
2002	103.59044380198428
2003	102.2898765628572
2004	101.60600387640785
2005	101.13568012416746
2006	101.20623796890622
2007	101.05797073716067
2008	101.78457997125321
2009	99.67686568986971
2010	98.55928890287437
2011	98.11175917731101
2012	97.55486505433481
2013	97.60621023657558
2014	99.43082798829417
2015	100
2016	99.55136579687773
2017	100.06291202392342
2018	100.82350072592803
2019	101.32178422110269
2020	101.36537731415378
2021	102.46082909051921
2022	105.57539517946391