Year	base year varies by country
1990	3.815513578931345
1991	7.437496203238106
1992	22.92071386797038
1993	31.419512711760618
1994	38.51694071604628
1995	44.354205678364444
1996	49.43385181839421
1997	53.60153760313862
1998	57.583076621157645
1999	61.34406892864972
2000	64.75803055523306
2001	70.37593117224799
2002	75.7116136743152
2003	79.98209018031697
2004	82.67024191772106
2005	83.92730507494244
2006	85.79140679289925
2007	89.37532953427504
2008	93.36649019801604
2009	96.54065292341822
2010	95.54694271614856
2011	96.54064525924144
2012	97.00311767976855
2013	98.55551283071347
2014	99.00495712821873
2015	100
2016	100.87411542632634
2017	102.35097705969814
2018	104.5132350754822
2019	106.91165790739103
2020	108.1134070039311
2021	111.00702741207964
2022	118.20327720593005
2023	128.70262581020825