Year	maximum value in 2004 = 100
2006	11.6646991454
2007	12.6678246567
2008	12.940030528
2009	11.7930013398
2010	12.2360767377
2011	11.882793015
2012	12.1703507128
2013	13.4531739165
2014	12.1010366074
2015	12.2008769014
2016	12.4318540437
2017	12.0624554524
2018	10.2145152609
2019	10.7067864683
2020	10.5296889564
2021	10.6059227794