Year	maximum value in 2004 = 100
2006	13.0825674702
2007	12.8505075331
2008	13.8481232602
2009	14.3914367926
2010	13.4068784555
2011	14.6265419387
2012	13.5536038407
2013	14.5422240174
2014	15.2884374201
2015	18.7720165257
2016	15.5326793267
2017	15.9432625966
2018	17.3444249121
2019	17.3822270863
2020	16.7250428433
2021	16.4831343637