Year	maximum value in 2004 = 100
2006	19.1443319766
2007	20.8216983
2008	20.3702899842
2009	20.8613062494
2010	21.8374969244
2011	21.3495519612
2012	23.0452813711
2013	25.9302299627
2014	23.1349493171
2015	25.8463580865
2016	29.932786438
2017	30.2016515526
2018	31.4811601456
2019	30.5055815497
2020	29.2474289842
2021	25.5414998811