Year	maximum value in 2004 = 100
2006	11.4054570385
2007	11.006240827
2008	11.2900551948
2009	12.7693677522
2010	11.9371671727
2011	13.2121436296
2012	14.1036154
2013	15.7335421005
2014	17.017950773
2015	17.636388968
2016	17.6330366094
2017	18.1177787252
2018	18.8513912953
2019	17.9510312217
2020	18.4002866426
2021	19.1385509278