Year	base year varies by country
1960	11.160993238119744
1961	10.75265595974152
1962	11.171436175737073
1963	11.522884306176195
1964	12.195166729962025
1965	12.536318639750698
1966	13.02937183123074
1967	13.085524148405137
1968	13.741979457887357
1969	14.46934432732526
1970	16.643764538736896
1971	16.508249755560474
1972	17.4638792694592
1973	19.59486955892657
1974	22.92221648733504
1975	22.726163009292804
1976	25.502321568622566
1977	25.801259282113246
1978	27.12486173460319
1979	28.848487386215638
1980	31.133677863357352
1981	33.36970617345382
1982	36.977429553545434
1983	39.498805071544176
1984	41.239711745629364
1985	42.515044689968924
1986	42.47942679498654
1987	42.506205242126285
1988	43.68635870592675
1989	45.44297960006581
1990	46.585140980099304
1991	47.434314304953105
1992	49.20317383470019
1993	52.14196351363991
1994	53.989028607116886
1995	55.24809042689489
1996	57.33843387955619
1997	58.84043920232337
1998	57.644479938478696
1999	60.391020277813126
2000	63.17412415539475
2001	63.67324668380964
2002	64.6056847881087
2003	66.01794992985842
2004	68.07594504096647
2005	71.35538606401639
2006	75.9611444865529
2007	77.39869436401906
2008	82.5147212855659
2009	83.23316698242094
2010	87.10219288326158
2011	90.10674964892728
2012	93.04961565481477
2013	95.16744769918112
2014	97.82899780348433
2015	100
2016	98.8923830735954
2017	101.0115519031108
2018	103.1442482986032
2019	104.073305754166
2020	108.54951404593676
2021	113.59043659007759
2022	120.04640202449805
2023	124.16402310009782