Year	maximum value in 2004 = 100
2006	18.6136384247
2007	19.178253195
2008	18.446054048
2009	22.5490367922
2010	22.2761455032
2011	25.3045380203
2012	27.440455093
2013	26.5834499055
2014	29.9790611252
2015	28.2729691385
2016	29.8976744985
2017	30.8657480405
2018	30.5488209387
2019	31.2282136175
2020	31.5878780135
2021	35.188239069