| Year | Value | | 2021 | 44.45308724 | | 2020 | 36.18473435 | | 2019 | 50.68732735 | | 2018 | 46.9 | | 2017 | 32.25 | | 2016 | 22.19 | | 2015 | 15.26 | | 2014 | 10.5 | | 2007 | 3.88 | | 2006 | 2.537566129 | | 2005 | 1.792046794 | | 2004 | 1.44615998 | | 2003 | 1.458580228 | | 2002 | 1.050422706 | | 2001 | 0.793821864 | | 2000 | 0.647410011 | | 1999 | 0.348414425 | | 1998 | 0.296351104 | | 1997 | 0.162464548 | | 1996 | 0.054464499 | | 1995 | 0.005484436 | | 1994 | 0.002765448 |
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