Year	base year varies by country
1991	11.91178722297698
1992	14.408769117245582
1993	17.100743277895113
1994	20.319850080889765
1995	25.797683009020094
1996	31.54537955616568
1997	37.57405197306093
1998	42.466809595709506
1999	46.07195051208756
2000	51.16306396111141
2001	56.632467682088475
2002	60.58970407992701
2003	63.981887756087076
2004	66.82081625357306
2005	69.37864900337475
2006	72.64644615299405
2007	76.37578277307236
2008	80.57788153253169
2009	84.23227564545913
2010	86.29597512663484
2011	89.02073108262158
2012	92.38374052291124
2013	94.64810331888894
2014	97.62913940193364
2015	100
2016	100.9991341921203
2017	105.63853595756885
2018	111.69677930784209
2019	116.92568684845517
2020	122.4026095815465
2021	133.60143396959162
2022	160.285080221833
2023	174.14164666393668