Year	base year varies by country
1970	10.477618640116654
1971	11.29551062632303
1972	12.245368651178367
1973	13.928762421014934
1974	17.316745973867008
1975	20.006489241707897
1976	22.093426956225347
1977	24.31705902128275
1978	25.91020274368011
1979	28.175521631751227
1980	31.69178478719629
1981	34.99612833406413
1982	38.16766638103399
1983	41.37140475197999
1984	44.31394118891475
1985	46.923353137037275
1986	48.54286976553378
1987	50.511745344695434
1988	53.73354915898374
1989	57.580352727872096
1990	61.14362869647347
1991	62.89646489935479
1992	63.7314166824286
1993	65.02682016622957
1994	65.70373654598825
1995	66.29757685561466
1996	67.07277839168566
1997	68.32622911757697
1998	69.7408446129534
1999	70.90527241202471
2000	73.26072525832849
2001	75.57860029167796
2002	76.76777439804418
2003	77.80222446470027
2004	78.92247364976669
2005	80.55431975659022
2006	82.24135517289655
2007	84.80025222247168
2008	88.2730521260706
2009	89.39852463556484
2010	90.20352080765164
2011	93.26382643884892
2012	96.38929160035701
2013	98.46161916252187
2014	99.55148401119145
2015	100
2016	100.1500225033755
2017	101.16687836556524
2018	102.94068977530047
2019	104.66032994646564
2020	105.77912577103189
2021	108.3481426712154
2022	115.32893273632926
2023	120.16476000189876