Year	maximum value in 2004 = 100
2006	75.0490606897
2007	80.3726162187
2008	77.0966128851
2009	79.8499203413
2010	80.5287929187
2011	79.5092929677
2012	79.0659809313
2013	82.1849599548
2014	79.7034750222
2015	82.7395084202
2016	82.1084528016
2017	86.8417647145
2018	88.0620238044
2019	91.9299234884
2020	90.7878926955
2021	90.7426763023