Year	base year varies by country
1970	7.955414488950755
1971	8.250225544854514
1972	8.525333044295198
1973	11.384548362600174
1974	14.198139470714533
1975	16.71366430394203
1976	19.934870737479073
1977	21.541389630043447
1978	21.245216852537105
1979	22.843274681412318
1980	25.69856841923223
1981	27.322869422816854
1982	33.41477902524304
1983	34.89066320080764
1984	41.29382411017552
1985	45.79108252214497
1986	45.502614772162026
1987	47.35415145579236
1988	47.46257901249568
1989	52.0933425396066
1990	57.431081248758964
1991	51.748785657318685
1992	54.04142915287089
1993	55.15287668548729
1994	79.05291592804016
1995	81.51404214690928
1996	90.55297037268079
1997	86.96699229416811
1998	84.09720364248497
1999	87.89931066187393
2000	88.56884414130948
2001	100
2002	97.69959200909338
2003	101.95941195553327
2004	102.36723638786603
2005	108.32987582511109
2006	113.27069417889018
2007	118.23382663274768
2008	124.65259843143937
2009	124.05556842067824
2010	126.70603037403802
2011	125.1078252729774
2012	120.44733798081985
2013	120.76124317231296
2014	129.20400626557495
2015	124.68947408214235
2016	121.89074138714953
2017	120.26778395770911
2018	98.35447677697313
2019	96.12445283766674
2020	99.78608520721858
2021	99.05941650404064
2022	100.53005341808378
2023	104.36413925653237