Year	maximum value in 2004 = 100
2011	9.0679276404
2012	9.0691845575
2013	9.1250421818
2014	8.862823816
2015	9.894909579
2016	11.4771948707
2017	11.7206396261
2018	10.6813117363
2019	10.6347150489
2020	10.1190819571
2021	9.0865523647