Year	maximum value in 2004 = 100
2006	41.1980716222
2007	45.4991119022
2008	42.8236561329
2009	43.9849168375
2010	48.68251257
2011	52.9266210129
2012	49.3304615976
2013	49.973901955
2014	53.7831380584
2015	50.9785568057
2016	52.7322873462
2017	56.7460549562
2018	57.8308861074
2019	64.611879848
2020	70.0021333367
2021	69.4548803031