| Year | Value | | 2017 | 110.63159556011 | | 2016 | 109.48639324958 | | 2015 | 108.86158434192 | | 2014 | 108.70321889084 | | 2013 | 107.50670896131 | | 2012 | 105.80911494805 | | 2011 | 102.899795843 | | 2010 | 100 | | 2009 | 97.47974107597 | | 2008 | 95.381731780904 | | 2007 | 91.455367656793 | | 2006 | 89.225666645763 | | 2005 | 87.394524690455 | | 2004 | 85.945915814852 | | 2003 | 84.733515890104 |
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