Year	base year varies by country
1986	5.288595122421657
1987	5.484377021216883
1988	6.044443769651938
1989	6.6426467852247875
1990	7.081464070973312
1991	8.163058327747141
1992	8.97483902388773
1993	9.805748646606348
1994	11.030638963664764
1995	12.308397758848136
1996	13.32279664775952
1997	15.070403394816815
1998	15.671377030016393
1999	16.77110590944018
2000	29.028974242450577
2001	30.99650080074049
2002	32.194450248171
2003	33.59034538207039
2004	36.25873893750012
2005	38.31620153701862
2006	41.40376565600907
2007	45.831807431012614
2008	52.09960080697533
2009	58.830278792366705
2010	64.80927406035832
2011	75.27491737628976
2012	83.91335758624187
2013	90.19524470194648
2014	96.52137465458162
2015	100.48040872472465
2016	99.99999715022292
2017	103.47185301658193
2018	107.55704681578419
2019	116.84936794483794
2020	127.36582160996225
2021	139.59062648027515
2022	161.73576540407754
2023	196.1663217230295