| Year | Value | | 2023 | 38.4266 | | 2022 | 37.8861 | | 2021 | 37.0967 | | 2020 | 29.2986 | | 2019 | 26.5883 | | 2018 | 25 | | 2017 | 24.4 | | 2016 | 23.12 | | 2015 | 22.7428 | | 2014 | 16.3647 | | 2013 | 15.5 | | 2012 | 12 | | 2011 | 8.4 | | 2010 | 6.4 | | 2009 | 4 | | 2008 | 3.5 | | 2007 | 3 | | 2006 | 2.4 | | 2005 | 2.4 | | 2004 | 2.1 | | 2003 | 1.8 | | 2002 | 1.1 | | 2001 | 0.799846 | | 2000 | 0.401434 | | 1999 | 0.162 | | 1998 | 0.0816 | | 1997 | 0.0331 | | 1996 | 0.0168 | | 1995 | 0.00768 | | 1994 | 0.00174 |
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