Year	base year varies by country
1981	0.1415779897146072
1982	0.1443832460167097
1983	0.145688831866444
1984	0.14119055257061663
1985	0.1391460273711086
1986	0.12638305288353005
1987	0.12740648871898533
1988	0.12859262747619932
1989	0.1377840926399838
1990	0.169809146379376
1991	0.32827495871267554
1992	0.898457975031307
1993	3.763615528247584
1994	6.184350014876553
1995	9.911807765775112
1996	10.983033596400684
1997	13.36329138035515
1998	13.105139719751882
1999	14.531209176004634
2000	16.27490943209056
2001	17.975400612183
2002	19.12037743120763
2003	21.077649118207365
2004	24.59581923252584
2005	29.539194902552563
2006	36.03391020883006
2007	40.224137834950625
2008	48.851714111653685
2009	49.744090173031616
2010	69.23292332517431
2011	79.7004328078695
2012	89.88963808898279
2013	92.50349243603958
2014	99.39392643232907
2015	100
2016	102.99312676057677
2017	114.11684422413681
2018	123.20124782974983
2019	135.4871389982038
2020	140.50927027440022
2021	160.7707990544863
2022	189.25088375870754
2023	226.15371693543972