Year	base year varies by country
1960	2.2717084382380865
1961	2.2846546616405314
1962	2.406760404148712
1963	2.5666015599141585
1964	2.659549724493297
1965	2.792600427703091
1966	3.016828958683385
1967	3.2019169014213054
1968	3.3774932623884597
1969	3.397968807871901
1970	3.4007551558104727
1971	4.0946350136992296
1972	4.1482398705294115
1973	5.082432311078495
1974	7.19059861131775
1975	6.728460655943931
1976	7.108130454240889
1977	7.669173302258627
1978	7.3272108392911335
1979	9.276623796882665
1980	12.35666392367776
1981	13.581205615242025
1982	12.261119658773566
1983	12.36352705259863
1984	11.559394702750817
1985	11.414604823743542
1986	10.51993026630491
1987	12.719221600559985
1988	10.45834605595694
1989	10.568980538256039
1990	11.065988317137968
1991	10.498598145968224
1992	11.46416584847306
1993	11.651506652865496
1994	12.208137076813703
1995	13.3785167287606
1996	14.938711383816328
1997	16.493907281908513
1998	15.4007999178597
1999	20.017707141160464
2000	22.681435866105243
2001	24.311068603385646
2002	30.935179073680956
2003	35.378264360450004
2004	43.3756421879722
2005	55.76741426025694
2006	66.74216982376396
2007	68.37026908285154
2008	84.58043017267495
2009	63.56450422578668
2010	75.81881599496931
2011	94.27520336641768
2012	99.9146805140392
2013	100
2014	98.99339598334758
2015	92.02356075359403
2016	96.34159547086409
2017	98.08216422156488
2018	101.61074255493881
2019	104.07938901760086
2020	225.99055118314672
2021	210.83759623277552
2022	259.66750389283465
2023	238.35499733014004