Year	maximum value in 2004 = 100
2006	16.1929506932
2007	19.4702604005
2008	19.5629916642
2009	19.8142441033
2010	19.8380426613
2011	24.0317340751
2012	24.1880407026
2013	25.1481509644
2014	26.204618433
2015	25.7066926469
2016	24.2942227833
2017	28.1794796318
2018	27.5124493353
2019	27.2302724674
2020	27.8453440579
2021	28.1617431568