Year	maximum value in 2004 = 100
2006	12.9891858202
2007	12.8417245869
2008	13.4953481096
2009	13.8452182071
2010	13.4100944117
2011	14.1051440916
2012	15.1673204393
2013	15.656963868
2014	18.2529565933
2015	15.9764685296
2016	14.6993398925
2017	14.4938772345
2018	13.2705121844
2019	14.7876564838
2020	14.7027762612
2021	14.9923013473