Year	base year varies by country
1970	5.3096054296647415
1971	5.546331234310658
1972	5.873450172219067
1973	6.638038121123158
1974	7.777811152006196
1975	7.771832819540878
1976	7.775067646570945
1977	7.7759041975515
1978	6.541241234300226
1979	6.934120212843464
1980	7.8020763661894
1981	8.072227572240797
1982	8.660462841603673
1983	9.280409898407042
1984	10.223641900486482
1985	10.889059360141308
1986	11.671485958604002
1987	11.800009173951823
1988	13.56586542173474
1989	14.326627674876526
1990	15.215645505566961
1991	16.576119631021783
1992	18.05525478001517
1993	19.5923799995235
1994	22.01032559550161
1995	23.83374520375669
1996	25.767289400436304
1997	29.093041185921265
1998	32.20491061274265
1999	34.19203700694157
2000	39.843005111979664
2001	41.969557991917846
2002	44.13736667009615
2003	45.737040002720725
2004	47.724717621484345
2005	50.816898672228874
2006	54.1581726415063
2007	56.69720413287165
2008	59.87575196808489
2009	62.52471476209623
2010	66.32740001034985
2011	72.40203604782019
2012	78.93275965418117
2013	83.9772951809551
2014	88.965997323819
2015	91.91629430695369
2016	95.73211098906746
2017	100.00000408880894
2018	101.15086282095874
2019	104.29463387725337
2020	109.80907503262402
2021	118.18533334371067
2022	125.03400801239393