Year | Value | 2021 | 4.44 | 2020 | 3.61 | 2019 | 3.67 | 2018 | 2.64 | 2017 | 2.74 | 2016 | 2.45 | 2015 | 2.7 | 2013 | 2.4 | 2011 | 2.42 | 2010 | 2.49 | 2009 | 2.36 | 2008 | 2.49 | 2007 | 2.49 | 2006 | 2.3 | 2005 | 2.42 | 2004 | 3.22 | 2003 | 2.61 | 2002 | 2.88 | 2001 | 3.01 | 2000 | 3.54 | 1999 | 7.18 | 1998 | 4.35 | 1997 | 6.74 | 1996 | 4.54 | 1995 | 8.68 | 1993 | 7.35 |
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