Year	maximum value in 2004 = 100
2006	16.5240967148
2007	17.8212777054
2008	12.293630465
2009	16.1172262266
2010	18.0624675704
2011	15.5122605373
2012	16.5995861445
2013	15.8838308658
2014	16.6888894698
2015	18.2203940377
2016	19.6274053159
2017	17.372956939
2018	17.857605049
2019	18.5518290235
2020	17.9382740189
2021	17.7822950205