Year	maximum value in 2004 = 100
2006	8.8441322738
2007	10.4895558112
2008	10.7950849447
2009	10.496836968
2010	9.8646879078
2011	11.332944415
2012	10.2577789151
2013	10.36175216
2014	10.287879848
2015	11.0139898985
2016	9.5864649854
2017	8.4665853397
2018	10.1833826808
2019	10.8401757189
2020	10.45123753
2021	10.8676079537