Year	base year varies by country
1990	0.403143845076073
1991	0.937593369787234
1992	9.12881097209598
1993	16.8705472251502
1994	23.5629259222194
1995	30.9637043680685
1996	37.9427636992022
1997	41.7076241193453
1998	44.5831582208243
1999	47.4636838945051
2000	49.2125813156703
2001	52.5592696387273
2002	55.1124218500113
2003	57.2555311524256
2004	59.9410843033582
2005	63.491844041816
2006	69.1925097102799
2007	77.7435886545874
2008	83.0321144877441
2009	82.7093838181761
2010	84.2166401800205
2011	88.8264373928369
2012	92.4436059228938
2013	96.1702387775993
2014	98.9741910723403
2015	100
2016	102.187309907464
2017	105.856207331938
2018	110.977297139996
2019	114.979080740591
2020	113.935698689195
2021	120.715240419328
2022	140.114572042117
2023	151.160684601097