Year	base year varies by country
1990	2.58630500215166
1991	3.50519366857864
1992	4.38150976550874
1993	6.77659578719031
1994	10.558935468648
1995	13.8849998170971
1996	18.0411102116483
1997	24.1049269962819
1998	29.3973192387749
1999	33.6269133127358
2000	38.5397375278621
2001	41.7167171212117
2002	44.9374423792767
2003	47.7592771100308
2004	51.0048149566596
2005	59.1981274731968
2006	55.1325386025954
2007	57.0716438317046
2008	58.2472568505467
2009	59.6312883990667
2010	50.4797328252233
2011	49.0219800820433
2012	48.0140663977187
2013	61.030633683048
2014	66.7025029434326
2015	71.3044884954253
2016	73.4695673515744
2017	75.0320918695213
2018	75.7892022921514
2019	87.0801282997025
2020	89.7479760607269
2021	93.8630972460884
2022	99.9955969489524
2023	110.209816313985