Year	base year varies by country
1980	0.08103369041059742
1981	0.09432786614579047
1982	0.1034430116179744
1983	0.1150594308818799
1984	0.1297548844741501
1985	0.14134307263511392
1986	0.16043750999730041
1987	0.187268865236776
1988	0.24549413714492246
1989	0.30075360582106336
1990	0.3328166034365567
1991	0.36840240026188864
1992	0.41731306851888317
1993	0.534889607180481
1994	0.6748802803250177
1995	1.196020166843295
1996	1.8220839571167737
1997	2.201712410394309
1998	2.6321137174671554
1999	3.6768199119963527
2000	4.7994984007195765
2001	6.0292484373153235
2002	12.823828514876226
2003	14.150594210119245
2004	16.251480025577322
2005	17.997089981109646
2006	21.5906156481958
2007	22.475771487020076
2008	25.16492281957772
2009	27.152907168026896
2010	30.445800516398357
2011	34.70524039135698
2012	40.82716305659482
2013	51.86939638235428
2014	62.74603602218413
2015	75.17895553359878
2016	90.43478260916643
2017	100
2018	106.12909400114843
2019	114.86966784268479
2020	124.53717943251519
2021	136.15863502840156
2022	165.8024348020476
2023	214.30310224341912