Year	base year varies by country
1981	6.702186499845595
1982	7.281121417540873
1983	8.28072890118915
1984	12.617011781886516
1985	14.711069457010002
1986	15.234099602465697
1987	16.097741446464024
1988	17.759952194256538
1989	19.72025560172792
1990	22.117296389821714
1991	25.941202565798182
1992	27.814546725286814
1993	30.134751676043724
1994	33.0067720150985
1995	35.678697881464444
1996	39.131249205600916
1997	41.913055275027666
1998	45.31474354917479
1999	47.65764914360503
2000	49.746697998251804
2001	53.26422355401811
2002	55.79142113407466
2003	57.563181938368515
2004	61.83039047479145
2005	65.5100408787771
2006	68.57094370977829
2007	70.8563881940377
2008	76.73546839542007
2009	78.07762565226372
2010	80.98824607656283
2011	86.22348816702825
2012	87.77628768779256
2013	89.07424747084043
2014	91.43028818815525
2015	91.11692840668233
2016	92.8939679268671
2017	95.41998006139212
2018	100
2019	101.46184315081885
2020	102.14502381724382
2021	106.81335292973924
2022	114.9383310295973
2023	119.25579613113695