| Year | Value | | 2018 | 87.707796000325 | | 2017 | 89.656326082634 | | 2016 | 84.420668842948 | | 2015 | 84.9555712242 | | 2014 | 86.705742918061 | | 2013 | 87.322713190763 | | 2012 | 89.44410647643 | | 2011 | 89.174838754086 | | 2010 | 96.225492359921 | | 2009 | 86.748193197058 | | 2008 | 88.869657959863 | | 2007 | 88.889446004944 | | 2006 | 83.472163772385 | | 2005 | 81.005014009505 |
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