Year	maximum value in 2004 = 100
2006	26.0778975556
2007	25.7265277024
2008	22.6377435694
2009	29.936990536
2010	30.3311551499
2011	29.0774881113
2012	23.0189802977
2013	18.9823207818
2014	19.9059520053
2015	26.8794681583
2016	29.8638714666
2017	35.7025616715
2018	18.4072150984
2019	18.0772512792
2020	31.2403187535
2021	31.078253289