| Year | Value | | 2023 | 58.490566253662 | | 2022 | 58.018867492676 | | 2021 | 59.047618865967 | | 2020 | 60.952381134033 | | 2019 | 63.333332061768 | | 2018 | 61.904762268066 | | 2017 | 64.761901855469 | | 2016 | 64.285713195801 | | 2015 | 63.333332061768 | | 2014 | 62.980770111084 | | 2013 | 60.189575195312 | | 2012 | 60.189575195312 | | 2011 | 59.715641021729 | | 2010 | 57.894737243652 | | 2009 | 60.287082672119 | | 2008 | 58.252426147461 | | 2007 | 63.106796264648 | | 2006 | 67.804878234863 | | 2005 | 63.725490570068 | | 2004 | 62.68656539917 | | 2003 | 62.162162780762 | | 2002 | 61.081081390381 | | 2000 | 60.10929107666 | | 1998 | 57.377048492432 | | 1996 | 60.655738830566 |
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