Year	maximum value in 2004 = 100
2006	9.3526513037
2007	9.3353994363
2008	9.5850396127
2009	7.4079126246
2010	7.5313741268
2011	7.8084762808
2012	9.1643295017
2013	10.6928252771
2014	10.8946490373
2015	9.9638390246
2016	10.1232487757
2017	10.4804652446
2018	10.9273533512
2019	10.4864457991
2020	11.1722429535
2021	11.0288112347