Year	maximum value in 2004 = 100
2006	16.9899724474
2007	18.8605260592
2008	17.8926232165
2009	21.9902567564
2010	21.1939612293
2011	23.4837069364
2012	20.4743058158
2013	19.8683943893
2014	23.0616073862
2015	26.4680884035
2016	25.4679334608
2017	26.7451620594
2018	34.4720594303
2019	33.3289967746
2020	33.9681172217
2021	33.8591078945