Year	base year varies by country
1991	3.4606866155382727
1992	4.769178108521115
1993	6.817840411725213
1994	10.243195275764105
1995	15.514329122836676
1996	23.088108329944777
1997	25.522760586890247
1998	27.094570299584486
1999	29.51622582688393
2000	32.944698643043864
2001	37.814607417325405
2002	41.53249327118095
2003	43.04433721088312
2004	45.53844000654216
2005	48.876884893987054
2006	52.52375767617937
2007	56.42957052543272
2008	59.33727573502476
2009	60.21034852676728
2010	64.81356694355806
2011	66.33562430875614
2012	68.44193598689002
2013	70.2222724490217
2014	70.98479566823508
2015	75.99628698813325
2016	85.23811283436879
2017	92.03842004722947
2018	95.53138726476925
2019	100.00000675584357
2020	103.17166803752112
2021	107.8665620552102
2022	114.77104498923556
2023	122.54265610967371