Year	base year varies by country
1970	4.700846640322722
1971	5.02938905779753
1972	5.300925280645049
1973	6.119631018925306
1974	7.565338366958671
1975	8.721320663494076
1976	10.387209536952339
1977	12.21995978311256
1978	13.887251119325084
1979	16.112858291662555
1980	19.649122978463907
1981	23.436011221122996
1982	27.240069429799597
1983	31.19945536835444
1984	34.64087047204878
1985	37.761286199094684
1986	39.58243006161262
1987	41.786002969404414
1988	44.68823968967538
1989	47.50524272945152
1990	51.3028956826093
1991	54.78965682834518
1992	57.25980972540346
1993	59.74300748038534
1994	62.06099511113619
1995	65.49500368657749
1996	68.216697728366
1997	69.93514992963395
1998	71.20293273015392
1999	72.33178334777705
2000	74.60735518130305
2001	76.58098490864255
2002	78.81024427025774
2003	81.1355803713043
2004	83.50014545551288
2005	85.73987714018314
2006	88.25365456879025
2007	90.14816818123678
2008	92.9387609159402
2009	93.21042529026323
2010	94.62558936376878
2011	96.86689962414314
2012	98.7318986659639
2013	99.44121827934525
2014	99.67689664350962
2015	100
2016	100.30378103106108
2017	101.42579529520984
2018	102.64962369746739
2019	103.3564010031595
2020	104.05426882230728
2021	106.72859404299753
2022	114.13325601003905
2023	116.8999043743872