Year	maximum value in 2004 = 100
2006	11.773523576
2007	13.6495097797
2008	11.3900913383
2009	14.3961491153
2010	15.9191253288
2011	14.8978858676
2012	13.9641176763
2013	14.1961989044
2014	14.7569002639
2015	12.8748402553
2016	14.4390592205
2017	9.6708023641
2018	9.4337220519
2019	8.9802116977
2020	8.6872746828
2021	8.3910750562