Year	maximum value in 2004 = 100
2006	4.3556714589
2007	4.3556714589
2008	4.5560583135
2009	4.5519501483
2010	4.6520478402
2011	4.5572234333
2012	4.5572658013
2013	4.5552321376
2014	4.4040692931
2015	4.4050755329
2016	4.4050755329
2017	4.5143039346
2018	4.6562253784
2019	4.5735457916
2020	6.0414674084
2021	6.0372094252