Year | Value | 2022 | 15.934 | 2021 | 20.514 | 2020 | 25.225 | 2019 | 15.613 | 2018 | 19.329 | 2017 | 19.136 | 2013 | 22.21 | 2012 | 19.06 | 2011 | 18.86 | 2009 | 15.37 | 2008 | 12.72 | 2007 | 14 | 2006 | 16 | 2005 | 18.7 | 2004 | 20.97 | 2003 | 22.18 | 2002 | 20.39 | 2000 | 16.49 | 1999 | 18.09 | 1998 | 21.6 | 1997 | 20.47 | 1996 | 16.33 | 1995 | 15.83 | 1994 | 17 | 1993 | 16.8 |
|