Year	base year varies by country
1970	8.561275007841205E-12
1971	1.0295106571606657E-11
1972	1.2245141678084525E-11
1973	1.484909514806556E-11
1974	2.049592061596565E-11
1975	2.743562784371964E-11
1976	4.0060863858413766E-11
1977	5.81115039931966E-11
1978	8.154036076504178E-11
1979	1.2879826119951514E-10
1980	2.458025754377958E-10
1981	5.16561250567948E-10
1982	1.0552194866610656E-09
1983	2.5325691087609497E-09
1984	7.859687704025412E-09
1985	2.6294291417401667E-08
1986	6.410510199918888E-08
1987	1.981600400692945E-07
1988	1.4872752105281507E-06
1989	1.9818621008461474E-05
1990	0.000566153779867952
1991	0.002912554996899955
1992	0.03089433386769856
1993	0.6492268013392055
1994	15.16326245697615
1995	29.243920270599777
1996	34.514959014562
1997	37.07988622369531
1998	38.97164886291025
1999	42.81064921957704
2000	45.35419107441487
2001	49.33323181878691
2002	54.080977689211274
2003	61.86359252050061
2004	66.26779847120507
2005	71.59643077014428
2006	75.84951407675575
2007	80.59446794818344
2008	87.31086112966287
2009	93.69733022839564
2010	99.99999999490615
2011	107.46052151840624
2012	116.63736171800369
2013	125.81285891467911
2014	136.36782937785878
2015	148.44357067652314
2016	160.5304153469399
2017	165.5451278625431
2018	172.80594307481147
2019	180.96849216243876
2020	192.37186209707156
2021	214.59869083616337
2022	231.3766308968498
2023	242.01776222325435