Year	maximum value in 2004 = 100
2006	7.643580608
2007	8.5879706306
2008	9.203258023
2009	9.384443851
2010	7.1392173473
2011	8.383930746
2012	8.2905179134
2013	7.5525348066
2014	7.949612716
2015	10.4663559007
2016	8.2900254337
2017	27.3417284307
2018	34.6985263213
2019	34.0499184712
2020	36.8528126453
2021	37.7257468078