Year	base year varies by country
1980	0.04811378064509406
1981	0.049471040743750624
1982	0.050419139785753506
1983	0.050093799330388426
1984	0.051464740630343425
1985	0.05158268604507967
1986	0.05227672572912157
1987	0.05231009856361265
1988	0.049490718250377146
1989	0.05282128726440864
1990	0.06665412632138193
1991	0.21765095759572634
1992	0.3473244585084559
1993	0.5247761848006586
1994	0.9063145432802967
1995	2.1385000909847025
1996	3.4850332830598374
1997	35.31081374871024
1998	47.29919821002645
1999	48.86912462554325
2000	52.47607528554943
2001	55.68642135113687
2002	57.82944658759842
2003	59.09557040541873
2004	62.39402360394587
2005	66.5084468634709
2006	71.00207297400945
2007	78.84881858010306
2008	85.2382980832073
2009	88.59499873447761
2010	89.2719796979306
2011	94.72902398016562
2012	95.78258024133022
2013	95.85149726160464
2014	97.13665816796637
2015	100
2016	103.32355974481327
2017	108.29664716391953
2018	112.88258293878897
2019	118.79679106350342
2020	123.85765991424893
2021	132.69427440326734
2022	154.16680336218894
2023	165.7455575561495