Year | Value | 2022 | 6.9115943491053 | 2021 | 9.30954947011 | 2020 | 10.585839557524 | 2019 | 8.1840411158691 | 2018 | 7.9848063898871 | 2017 | 8.1286669671718 | 2016 | 7.7704680442341 | 2015 | 6.5159610537753 | 2014 | 5.9553997023658 | 2013 | 6.1643704581647 | 2012 | 6.3732029116563 | 2011 | 6.5263340002693 | 2009 | 7.7245772535845 | 2008 | 6.6816819388406 | 2007 | 7.3088651088727 | 2006 | 7.0322339694067 | 2005 | 8.1122902258253 | 2004 | 8.3285028880584 | 2003 | 8.8952861806247 | 2002 | 9.3936443685062 | 2001 | 8.9321336131703 | 1999 | 9.6446944466972 | 1998 | 8.9525261660489 | 1997 | 8.5012868244633 | 1996 | 8.6623574881274 | 1995 | 8.3359285747147 | 1993 | 5.9401407848794 | 1992 | 6.4821564571637 |
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