Year	base year varies by country
1960	1.0038185184999856E-07
1961	1.0349703632150232E-07
1962	1.066152522815299E-07
1963	1.1196072702561606E-07
1964	1.2713990823170731E-07
1965	1.4275009703823593E-07
1966	1.5604999010429068E-07
1967	1.718346143708731E-07
1968	2.0327312090910755E-07
1969	2.1981636253140367E-07
1970	2.4615275863721554E-07
1971	2.624981447063733E-07
1972	2.8121292309212974E-07
1973	3.1657694461350737E-07
1974	3.648024887393975E-07
1975	4.457578802530325E-07
1976	5.782055740972878E-07
1977	7.848640012940257E-07
1978	1.285122324364871E-06
1979	2.2663112329165454E-06
1980	3.125922474283396E-06
1981	5.1681057863437735E-06
1982	8.613337363957237E-06
1983	1.786379065171751E-05
1984	3.7241990092894374E-05
1985	9.896499212410073E-05
1986	0.0001666209383269301
1987	0.0003093311776738487
1988	0.002122874081134296
1989	0.05673011445093956
1990	3.6087384820980644
1991	17.25123432394384
1992	29.199545764428603
1993	42.74366246537482
1994	54.15119421678276
1995	61.50427542754275
1996	67.46265092607794
1997	72.37604425589174
1998	76.26342699000891
1999	78.50141188758509
2000	81.26836688313149
2001	81.63833974416316
2002	81.72733943242017
2003	83.20147561208992
2004	88.4257283624937
2005	91.52392041493442
2006	98.5312188134339
2007	100
2008	101.10327629202855
2009	103.18974292089722
2010	109.08262907603361
2011	116.44111102359102
2012	117.84141428899417
2013	119.08727420114585
2014	121.98400198584231
2015	125.26600705483455
2016	129.1253057831138
2017	133.7940355687796
2018	136.84108142888672
2019	139.40304241637014
2020	144.58768021723637
2021	159.16660324501416
2022	166.75321880462795
2023	177.70280816766706