Year	base year varies by country
1990	17.3502709325089
1991	20.4433422558722
1992	23.2929377315286
1993	25.9245677472879
1994	27.9380346091756
1995	31.5187180932966
1996	33.4104854411036
1997	36.4237573820674
1998	40.037807711255
1999	43.2933829850501
2000	46.020960601759
2001	51.300970686571
2002	58.5892649345644
2003	60.0181474428749
2004	65.780125204671
2005	69.6761788779488
2006	76.1637198671411
2007	71.0741140882262
2008	82.9575783242138
2009	84.9029591431925
2010	89.4343235824148
2011	97.8647669238913
2012	100.000223130414
2013	110.280141711726
2014	125.758127397218
2015	138.589278414495
2016	138.183972459674
2017	140.973782834732
2018	157.500236162913
2019	163.131585395991
2020	172.47384008389
2021	178.219858256701
2022	185.25845931106
2023	185.084288692254