| Year | Value | | 2022 | 37.735847473145 | | 2021 | 32.380950927734 | | 2020 | 33.809524536133 | | 2019 | 33.333332061768 | | 2018 | 28.57142829895 | | 2017 | 20.476190567017 | | 2016 | 24.761905670166 | | 2015 | 24.285715103149 | | 2014 | 19.230770111084 | | 2013 | 18.48341178894 | | 2012 | 13.270142555237 | | 2011 | 10.900473594666 | | 2010 | 6.6985645294189 | | 2009 | 11.961722373962 | | 2008 | 8.2524271011353 | | 2007 | 9.7087383270264 | | 2006 | 11.219511985779 | | 2005 | 6.8627452850342 | | 2004 | 6.467661857605 | | 2003 | 11.891891479492 | | 2002 | 17.297296524048 | | 2000 | 16.393442153931 | | 1998 | 47.540985107422 | | 1996 | 46.448085784912 |
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