Year	base year varies by country
1960	2.691463803997922E-13
1961	3.6231894937504063E-13
1962	5.443822449165242E-13
1963	9.71272829570792E-13
1964	1.8408889942091243E-12
1965	2.9257834960847507E-12
1966	4.0357115891794235E-12
1967	5.106343173121634E-12
1968	6.470079760875839E-12
1969	7.767446194109843E-12
1970	9.030053236788876E-12
1971	1.0780491592262562E-11
1972	1.2922261739970596E-11
1973	1.6744712855966024E-11
1974	2.2539363906475466E-11
1975	3.018684312514782E-11
1976	4.2624916468786406E-11
1977	6.197580000869143E-11
1978	8.566766789097771E-11
1979	1.322417179733454E-10
1980	2.540918085008531E-10
1981	5.095274504454604E-10
1982	1.0243254260663325E-09
1983	2.3711499308077703E-09
1984	7.154714491025215E-09
1985	2.4937303687031773E-08
1986	6.213860332717742E-08
1987	1.9027381482573138E-07
1988	1.3851010324376698E-06
1989	1.9452694224686702E-05
1990	0.0005518672311747286
1991	0.0028513770910689137
1992	0.030481590722975703
1993	0.6389399392831957
1994	14.952273533026842
1995	29.00412759161661
1996	34.35720008292967
1997	37.01267612099343
1998	38.8353141254346
1999	41.94621730640999
2000	44.29774957273292
2001	47.94128125728411
2002	52.63862180299701
2003	60.05594133068861
2004	64.71151439456294
2005	69.52037246998775
2006	74.22987306974696
2007	79.00956286866018
2008	85.94545900183114
2009	92.2310653168394
2010	100
2011	108.3185922188201
2012	116.92247549984836
2013	125.69699812723367
2014	135.56007672660564
2015	145.81678937823855
2016	157.63320507801348
2017	163.42052615619966
2018	170.7638836035343
2019	177.97739210169107
2020	189.49697810701403
2021	214.22116214594408
2022	232.58051974532293
2023	243.41643397002363