Year	maximum value in 2004 = 100
2006	59.9000621229
2007	59.2992468943
2008	58.3464240438
2009	55.093611272
2010	61.437545626
2011	63.3185685372
2012	62.8792751917
2013	62.2282907448
2014	62.0073241303
2015	62.3856976286
2016	64.2838372899
2017	67.1659312372
2018	66.1142975773
2019	69.3683980829
2020	75.9605517621
2021	76.3400650779