| Year | Value | | 2021 | 57.14684935 | | 2020 | 53.4046527 | | 2019 | 44.91635601 | | 2018 | 37.6 | | 2017 | 30.4 | | 2016 | 24.57183396 | | 2015 | 19.7042915 | | 2014 | 17.6 | | 2013 | 15.5 | | 2012 | 13.5 | | 2011 | 10.6 | | 2010 | 10 | | 2009 | 7.3 | | 2008 | 5.3 | | 2007 | 3.9 | | 2006 | 2.805573063 | | 2005 | 2.566351177 | | 2004 | 2.320664609 | | 2003 | 1.880412532 | | 2002 | 1.714729584 | | 2001 | 1.448799428 | | 2000 | 0.980216487 | | 1999 | 0.497901643 | | 1998 | 0.303808975 | | 1997 | 0.206216818 | | 1996 | 0.084093291 | | 1995 | 0.030046478 | | 1994 | 0.013166228 |
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