Year	maximum value in 2004 = 100
2006	57.9341724565
2007	59.2545171586
2008	58.8904517603
2009	58.3634699371
2010	63.3126445596
2011	61.2200460394
2012	65.7970826065
2013	67.826460655
2014	68.0696989678
2015	71.892672219
2016	71.5452975523
2017	75.53570876
2018	74.7042701226
2019	75.5448223971
2020	77.4494014959
2021	74.288607133