Year	base year varies by country
1997	33.70817792477055
1998	38.78444850526215
1999	43.67194942353165
2000	61.908741756034615
2001	70.5808442539737
2002	71.11040446153449
2003	79.83404085026051
2004	89.12528215725779
2005	99.99706040150727
2006	102.04718732715918
2007	110.47211447048826
2008	136.48131987102616
2009	151.55031491967344
2010	161.82507202006036
2011	179.59764106031366
2012	204.11642983820508
2013	218.20290636882388
2014	230.23878645360264
2015	241.70285219291273
2016	253.42067994134877
2017	278.83345526577125
2018	271.88838931884527
2019	268.74383314125146
2020	276.03544381666165
2021	302.4706791141827
2022	350.9925508508752
2023	388.4491345655574