Year	maximum value in 2004 = 100
2006	32.1479533553
2007	33.1066462927
2008	34.3241460021
2009	30.9489918691
2010	32.5248578449
2011	33.6927649007
2012	33.8492400942
2013	35.7414886178
2014	36.5000823136
2015	35.2271001245
2016	34.3248847961
2017	35.316179019
2018	34.9561709531
2019	36.2423406857
2020	36.813579733
2021	39.7428613638