Year	maximum value in 2004 = 100
2006	7.7354532376
2007	8.6463020636
2008	7.6765416045
2009	10.8855983026
2010	9.9762801626
2011	11.2910368953
2012	11.038700943
2013	13.5410576196
2014	13.2794294733
2015	16.8003269471
2016	18.4266047292
2017	19.1441997628
2018	10.0265660128
2019	8.9116560094
2020	9.5230670592
2021	8.3825033537