| Year | Value | | 2022 | 32.373616567713 | | 2021 | 38.52553384539 | | 2020 | 47.932076216856 | | 2019 | 41.933211597652 | | 2018 | 39.295577142087 | | 2017 | 43.104366772908 | | 2016 | 45.250858547361 | | 2015 | 42.517504063812 | | 2014 | 31.24804652718 | | 2013 | 29.119617843728 | | 2012 | 25.65706084926 | | 2011 | 24.450386604268 | | 2010 | 30.518685430986 | | 2009 | 34.910080733512 | | 2008 | 25.590169287126 | | 2007 | 29.542791364526 | | 2006 | 31.046744069563 | | 2005 | 30.256460876915 | | 2004 | 30.524967102985 | | 2003 | 31.901754549806 | | 2002 | 35.137052380682 | | 2001 | 34.06328320802 | | 2000 | 34.894657055348 | | 1999 | 46.769080712021 | | 1998 | 56.892581888671 | | 1997 | 52.453554754792 | | 1996 | 60.292336859908 | | 1995 | 63.905206115795 | | 1994 | 64.374322858866 |
|