Year	maximum value in 2004 = 100
2006	25.1728356258
2007	24.7785162458
2008	26.7313326641
2009	24.9913184239
2010	27.8839303744
2011	27.2408096742
2012	30.4442166642
2013	30.3170868717
2014	33.3707108156
2015	31.1218666171
2016	32.2972064139
2017	33.1984930686
2018	32.8881444802
2019	33.9198070243
2020	33.0659050704
2021	36.0329182168