Year	base year varies by country
1960	0.6506199370230228
1961	0.7587746922416261
1962	0.8583818273872951
1963	1.1223077120007563
1964	1.4646383813419586
1965	1.5525693462966803
1966	1.8400979376589133
1967	2.0867640232798945
1968	2.3924819177982544
1969	2.749869964810093
1970	3.1350906045161047
1971	3.5129941967664924
1972	4.006362407995689
1973	4.6163778928430945
1974	6.373927291391253
1975	7.945679878389029
1976	9.385569725970885
1977	10.81166651168973
1978	13.168544637536113
1979	15.814601732877733
1980	20.268941514119028
1981	23.806576187466717
1982	25.17155359772402
1983	26.311773075537847
1984	27.40720393033506
1985	28.603216929270904
1986	29.482898133949302
1987	30.74858984951537
1988	33.01882530247832
1989	34.83932423772561
1990	38.681779870530995
1991	42.435879980898086
1992	45.61218023394309
1993	48.275732572403044
1994	52.20605035124088
1995	56.18642501640141
1996	59.19257871374091
1997	62.555468903235436
1998	65.1325241173695
1999	65.93197054058638
2000	68.61456523273797
2001	71.55650575922627
2002	73.43001086298031
2003	76.38853411984935
2004	79.51080787016048
2005	81.5986513017618
2006	82.80541048361975
2007	84.82981731661982
2008	89.67778551683693
2009	91.35505733460757
2010	93.94893021020431
2011	97.48181954834496
2012	98.72261015683215
2013	98.91461418755497
2014	99.73301053737408
2015	100
2016	101.10026233640997
2017	103.03608284024017
2018	104.79563087568742
2019	106.4706338672223
2020	107.73179298798748
2021	111.4812165913613
2022	117.00103327791172
2023	119.3505357696807