Year	maximum value in 2004 = 100
2006	15.2380422881
2007	16.7493417929
2008	15.4341091745
2009	16.4969489127
2010	13.4832128224
2011	14.4379041431
2012	13.6455360717
2013	13.8238010552
2014	14.0182795776
2015	16.6148453051
2016	16.67368058
2017	18.6591155682
2018	17.0942938673
2019	16.8825451148
2020	17.0321028723
2021	17.5368934006