Year	maximum value in 2004 = 100
2006	31.3788611969
2007	30.944133504
2008	34.6497459388
2009	32.4996176217
2010	36.8622121965
2011	38.5225012776
2012	38.4062703422
2013	39.3915348429
2014	40.0565760249
2015	46.7216813463
2016	44.4227701304
2017	45.0349544405
2018	45.184283328
2019	49.0962441615
2020	48.4002409425
2021	47.2803765363