Year	maximum value in 2004 = 100
2006	23.2622370108
2007	22.2841571525
2008	22.4741442833
2009	23.9974380801
2010	25.7901792911
2011	23.3177928083
2012	30.7808288749
2013	30.0039486071
2014	31.750832033
2015	34.2809212316
2016	37.6500090103
2017	38.5586658414
2018	38.667335723
2019	41.3157463763
2020	41.5863010694
2021	41.4695768989