Year	maximum value in 2004 = 100
2006	16.667048508
2007	16.6995783085
2008	18.8724203544
2009	19.8675497977
2010	20.349238435
2011	20.5144801356
2012	19.9416901125
2013	21.4302034565
2014	21.714283643
2015	22.7546413984
2016	20.6238379517
2017	19.5846188798
2018	20.084039529
2019	36.6509751579
2020	39.9862068986
2021	37.1852140752