Year	base year varies by country
1990	4.40950400800731
1991	5.64913042391057
1992	7.08262444819604
1993	8.81517507253367
1994	11.5628611118537
1995	14.6688712391201
1996	17.5019665459174
1997	21.1051370290604
1998	24.1067335982141
1999	26.888650655448
2000	29.0938169263499
2001	30.4949661930712
2002	32.7006764534692
2003	35.4536426263388
2004	37.8948468436067
2005	40.3300464475876
2006	42.5522704363416
2007	46.4242672761767
2008	54.0289125871964
2009	58.9140244909297
2010	64.4688606933797
2011	72.333044945647
2012	79.916364702843
2013	87.6412272238505
2014	92.9442628187056
2015	100.000000148067
2016	107.472033826728
2017	110.307279272753
2018	113.66212321107
2019	116.254084418822
2020	123.721100525439
2021	127.029777967289
2022	130.539121456213
2023	134.191382350119