Year	base year varies by country
1970	12.76163291519513
1971	14.222551996929248
1972	15.033236532056488
1973	16.18526240774785
1974	18.702654926421978
1975	21.774725707519675
1976	24.64768099684319
1977	26.36860851883179
1978	28.81488841110097
1979	30.976716097708422
1980	34.55739236759739
1981	39.71570717587476
1982	44.885448966623706
1983	49.24702656179455
1984	53.61564642780598
1985	57.59589134865743
1986	59.97436386363834
1987	62.74561615409525
1988	66.73011239110113
1989	70.30007930505403
1990	73.88017057328142
1991	76.26300932638428
1992	77.4417900101772
1993	78.24874620440868
1994	78.61524323762687
1995	80.23147223957892
1996	81.01782185569384
1997	81.42024035425129
1998	82.2168777516978
1999	83.08875182811832
2000	84.84200194260963
2001	87.72854474706027
2002	90.45083489011503
2003	96.35996809459016
2004	95.84112354619268
2005	92.74624394893274
2006	94.82226024142192
2007	94.77720511987123
2008	92.86901377651432
2009	98.0126898784489
2010	100
2011	102.88404565929712
2012	106.42874241378826
2013	107.56473357586134
2014	108.62991868589876
2015	117.47715267879602
2016	121.63323877857502
2017	125.60638808837656
2018	127.92598682029728
2019	128.87886016375475
2020	129.784879119182
2021	129.24475560016774