Year	base year varies by country
1960	0.003415745520450937
1961	0.0037500651051631
1962	0.0037191634569712995
1963	0.0038417534829798547
1964	0.004345154819679968
1965	0.004905459190811527
1966	0.004748172253089873
1967	0.004732768534642039
1968	0.004893558446950146
1969	0.005212735154008259
1970	0.005661662546697891
1971	0.005629587222903245
1972	0.006192652178135901
1973	0.006850814322909403
1974	0.008065319723168369
1975	0.009298283803510912
1976	0.010904058193289962
1977	0.012034817443276743
1978	0.0135162292346176
1979	0.01563516985654078
1980	0.02964428540963802
1981	0.03548187856287988
1982	0.045570443625288885
1983	0.06219051220430266
1984	0.10672414391685067
1985	0.13662624718736016
1986	0.18999304236174952
1987	0.24643261100075042
1988	0.4039826895692557
1989	0.8188909600123232
1990	2.586305002151658
1991	3.505193668578641
1992	4.381509765508743
1993	6.776595787190306
1994	10.558935468647999
1995	13.884999817097091
1996	18.041110211648263
1997	24.104926996281915
1998	29.397319238774948
1999	33.62691331273583
2000	38.53973752786206
2001	41.716717121211715
2002	44.93744237927665
2003	47.75927711003082
2004	51.00481495665964
2005	59.19812747319683
2006	55.132538602595375
2007	57.07164383170461
2008	58.24725685054673
2009	59.63128839906668
2010	50.47973282522328
2011	49.02198008204331
2012	48.014066397718686
2013	61.03063368304801
2014	66.70250294343263
2015	71.30448849542529
2016	73.46956735157436
2017	75.03209186952134
2018	75.78920229215144
2019	87.08012829970248
2020	89.74797606072687
2021	93.86309724608843
2022	99.99559694895241
2023	110.20981631398534