| Year | Value | | 2023 | 24.352758007118 | | 2022 | 29.623189732092 | | 2021 | 31.527811513238 | | 2020 | 27.653388976156 | | 2019 | 33.689358715677 | | 2018 | 31.822206079317 | | 2017 | 41.338434815267 | | 2016 | 35.351000221451 | | 2015 | 30.542142754697 | | 2014 | 30.414573806132 | | 2013 | 23.699534634408 | | 2012 | 34.659347610012 | | 2011 | 36.556694018112 | | 2010 | 26.491146318733 | | 2009 | 43.098822477269 | | 2008 | 46.493578126231 | | 2007 | 54.582476085435 | | 2006 | 45.404128798263 | | 2005 | 42.692451594799 |
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