Year	base year varies by country
1960	0.7176718270274602
1961	0.768803889607137
1962	0.7075199642312074
1963	0.8033976130076316
1964	0.9321421086921753
1965	0.9970552263162321
1966	1.3645625504457264
1967	1.8689930939663961
1968	1.8848513459099794
1969	1.8606474104069828
1970	2.045528967602514
1971	2.043199802739336
1972	2.080924072196112
1973	2.162418339622657
1974	2.5063923135010198
1975	4.7112443042370264
1976	4.62215054925393
1977	5.246670863081666
1978	5.438947651318491
1979	5.768835365823587
1980	5.945637198757539
1981	6.404087554241242
1982	6.716810697036266
1983	6.881319673916339
1984	8.041282348694564
1985	8.408296928724173
1986	7.81788880626048
1987	7.869899381633952
1988	8.045034259325712
1989	8.471186703920393
1990	9.611532868787485
1991	11.051238266646022
1992	11.856131242335815
1993	13.500636233824551
1994	15.821571503471699
1995	23.932750597627557
1996	26.546545790870123
1997	30.693515090890784
1998	31.37742819345664
1999	34.86250742284236
2000	36.00439617170436
2001	35.863031958139466
2002	33.988417527617834
2003	40.90887902097728
2004	45.447665992830665
2005	49.55197208583533
2006	50.77173883515115
2007	57.33961848190122
2008	65.62747470329046
2009	70.31830452739509
2010	72.55947878770887
2011	77.77756868436376
2012	81.45089224238203
2013	83.64166874116614
2014	87.59991268959514
2015	88.025570509614
2016	92.45337195683273
2017	100
2018	99.39667125416088
2019	101.85292223233107
2020	108.68913931481265
2021	111.7949379616508
2022	129.5865424766799
2023	142.71382396589695