| Year | Value | | 2021 | 58.05481906 | | 2020 | 47.17942509 | | 2019 | 36.23662727 | | 2018 | 35.3 | | 2017 | 29.64312367 | | 2016 | 25.66476804 | | 2015 | 21.7 | | 2014 | 17.7 | | 2013 | 13.1 | | 2012 | 10.8 | | 2011 | 9.8 | | 2010 | 8 | | 2009 | 7.5 | | 2008 | 7.12 | | 2007 | 6.89 | | 2006 | 5.611738652 | | 2005 | 4.786684083 | | 2004 | 4.38602398 | | 2003 | 2.10143643 | | 2002 | 1.006454537 | | 2001 | 0.983794059 | | 2000 | 0.403967486 | | 1999 | 0.311090952 | | 1998 | 0.079871379 | | 1997 | 0.027347441 | | 1996 | 0.011238219 | | 1995 | 0.000692848 |
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