Year	base year varies by country
1990	3.60873848209807
1991	17.2512343239438
1992	29.1995457644286
1993	42.7436624653748
1994	54.1511942167828
1995	61.5042754275428
1996	67.462650926078
1997	72.3760442558918
1998	76.2634269900089
1999	78.5014118875851
2000	81.2683668831315
2001	81.6383397441632
2002	81.7273394324202
2003	83.2014756120899
2004	88.4257283624937
2005	91.5239204149344
2006	98.5312188134339
2007	100
2008	101.103276292029
2009	103.189742920897
2010	109.082629076034
2011	116.441111023591
2012	117.841414288994
2013	119.087274201146
2014	121.984001985842
2015	125.266007054835
2016	129.125305783114
2017	133.79403556878
2018	136.841081428887
2019	139.40304241637
2020	144.587680217236
2021	159.166603245014
2022	166.753218804628
2023	177.702808167667