Year	base year varies by country
1990	23.423523575633
1991	27.2638382906169
1992	29.4127368943266
1993	31.415633092734
1994	34.5761181982886
1995	37.2185302122573
1996	40.0802501518688
1997	42.5891999658371
1998	47.0429567683642
1999	50.0229585980939
2000	52.9327608641775
2001	55.9069797906012
2002	58.2724554358197
2003	60.1325887422518
2004	63.6748543453429
2005	67.4386071387724
2006	70.8857899869574
2007	73.1288217772292
2008	78.3788979848131
2009	80.5251148731508
2010	84.0447745248384
2011	87.3383260076345
2012	89.0800060318934
2013	90.9160013887712
2014	93.6917171949971
2015	93.0174340313201
2016	94.2083471578382
2017	96.3942257034852
2018	100
2019	100.697076301045
2020	102.359071662451
2021	104.695395425257
2022	110.441757363863
2023	115.518196243202