Year	maximum value in 2004 = 100
2006	17.6945941637
2007	17.6806520959
2008	13.4702216967
2009	13.8182155495
2010	12.6004810619
2011	11.4740841781
2012	11.6590255637
2013	10.994087756
2014	10.3613645605
2015	10.3940867075
2016	12.50867481
2017	12.8138476281
2018	12.4905013643
2019	13.9351673636
2020	13.0729219083
2021	12.7838867846