Year	base year varies by country
1990	31.6667565153674
1991	34.315789028683
1992	35.4994399471249
1993	36.1497355653998
1994	37.0908494833073
1995	38.2026734986843
1996	39.1498290642595
1997	40.2280547115328
1998	42.1246485631958
1999	43.5985450998144
2000	45.3532964398795
2001	49.3007338817342
2002	52.1957409347527
2003	52.4524725951185
2004	53.8555832311972
2005	55.506720610748
2006	60.2895596081403
2007	62.9019940283818
2008	70.5353280648314
2009	78.1564646618537
2010	83.1341361514238
2011	85.7085256579295
2012	88.6576534330065
2013	90.5412223733281
2014	94.2911246704179
2015	100
2016	102.260860866933
2017	103.21903782808
2018	105.935362569502
2019	110.656664173755
2020	115.100512004086
2021	122.427476419829
2022	133.265873815413
2023	141.129618577755