Year	base year varies by country
1990	1.52231562058126
1991	3.05693410311525
1992	4.87958895884046
1993	7.21456639769209
1994	10.0251581860335
1995	14.1403178877591
1996	17.8778496330357
1997	21.3248215815009
1998	23.9656673253685
1999	24.8962532446134
2000	25.7774084500945
2001	27.0215855720301
2002	30.4307035600335
2003	35.4644395176593
2004	39.0481409897593
2005	39.3128359880623
2006	42.2276465574415
2007	46.5834148611089
2008	50.7304514650803
2009	55.1019322849602
2010	58.2685615290299
2011	64.0228268511361
2012	70.0492395058362
2013	76.3531433586166
2014	84.1569359472426
2015	92.4509557147286
2016	99.9999999884645
2017	105.680183904017
2018	113.63319941108
2019	123.015312389963
2020	136.518064638971
2021	151.781633354677
2022	158.224237845244
2023	163.65286427836