Year	maximum value in 2004 = 100
2011	9.11426213
2012	9.9485028958
2013	9.7166537111
2014	8.8474098584
2015	9.7172986309
2016	10.6802128651
2017	8.5066278749
2018	8.2305880234
2019	8.3820318527
2020	9.5437176077
2021	6.5930880184