Year	maximum value in 2004 = 100
2006	4.162771181
2007	4.3099637325
2008	2.7661026785
2012	3.9223224835
2014	2.5927955202
2015	2.5927955202
2016	2.5927955202
2017	2.5927955202
2018	4.1931862026
2019	4.1931862026
2020	4.3569405011
2021	3.4628606755