Year	base year varies by country
1990	8.53599718391625
1991	13.2526473437737
1992	18.3715442632114
1993	24.0010991667612
1994	32.9376767851495
1995	42.1396889288366
1996	49.7047501222776
1997	56.4976723368095
1998	62.724703864612
1999	66.5913742091083
2000	70.6690056734763
2001	72.8737147647158
2002	74.2220390513413
2003	74.7980285823769
2004	78.4755693970081
2005	80.4839126428638
2006	81.8750167473731
2007	84.9183823639831
2008	88.2253915879282
2009	91.565209324799
2010	92.9966947314096
2011	95.8945311439145
2012	98.0274630726767
2013	98.2427952314343
2014	98.7000775995111
2015	100
2016	100.087276388011
2017	101.85092058039
2018	103.103321212121
2019	106.229967214119
2020	110.750093686501
2021	116.576611859943
2022	128.955222127905
2023	142.789842313588