Year	base year varies by country
1960	5.043810977262012
1961	5.074526713479284
1962	5.145698210185979
1963	5.095822527910168
1964	5.25586919971285
1965	5.673759924702863
1966	5.814632388586753
1967	5.605409266328055
1968	5.789890842773357
1969	6.165899776727648
1970	6.587110136287712
1971	6.808388334204479
1972	7.810948838984443
1973	9.060501566764072
1974	11.746551828189697
1975	14.603154491651429
1976	15.758475350749334
1977	15.753427948123793
1978	16.45160170083698
1979	17.790984227872528
1980	20.870906841074632
1981	21.071077621634885
1982	23.629079660646056
1983	25.239816211511997
1984	25.99890274983504
1985	28.1347788276946
1986	28.993254709572525
1987	31.121362611149255
1988	33.40194092279399
1989	34.353327231686265
1990	36.64794720131446
1991	38.84430691978799
1992	41.29408993935979
1993	44.28268570863699
1994	44.64936319411566
1995	45.15408609850575
1996	46.4493050042953
1997	47.97751314818533
1998	51.55085598277622
1999	55.02116730274989
2000	52.424237599212645
2001	54.12561181939921
2002	55.89359650408222
2003	60.198956917661015
2004	61.519727204821415
2005	65.60782749286118
2006	68.06599455528278
2007	70.12462089090327
2008	71.63799352937438
2009	72.63425953838188
2010	75.70653255252869
2011	82.81639081935438
2012	85.77833023456154
2013	88.88461794115231
2014	100
2015	102.53089804690228
2016	105.2308715028331
2017	107.01817320639707
2018	108.54395057324963
2019	110.22263604700622
2020	108.58852977498532
2021	105.85963250756242
2022	108.47707725817202
2023	113.25006932454716