Year	base year varies by country
1981	11.52484597227307
1982	12.431294276100758
1983	13.4577536779171
1984	14.334443340810111
1985	15.801739398045136
1986	18.356970456990357
1987	20.37844823930221
1988	22.226607177865034
1989	23.73915021961008
1990	26.646661348432403
1991	29.16778264478476
1992	31.34005457971616
1993	31.360667142686044
1994	40.33797574364517
1995	38.539999613808746
1996	39.018858722159
1997	38.2705521187163
1998	39.28872123029773
1999	41.8036989399685
2000	44.13139542082014
2001	44.90738476841948
2002	48.135980890034325
2003	52.44075140088418
2004	57.10336020788049
2005	61.360112359210895
2006	71.09380156226744
2007	72.2021705558177
2008	75.48325536043724
2009	79.2380865973323
2010	85.37159688839063
2011	85.7787358843712
2012	89.37635545251095
2013	87.25681723636343
2014	87.26709305199753
2015	91.87773522990727
2016	94.68456074660082
2017	100
2018	105.1398703881787
2019	113.23956275004139
2020	108.4856879934131
2021	106.37432673972845
2022	115.42758480601259