Year | Value | 2023 | 4.319 | 2022 | 4.268 | 2021 | 5.267 | 2020 | 5.125 | 2019 | 4.23 | 2018 | 5.211 | 2017 | 6.164 | 2016 | 7.575 | 2015 | 9.143 | 2014 | 11.424 | 2013 | 12.941 | 2012 | 12.27 | 2011 | 11.26 | 2010 | 10.279 | 2009 | 6.817 | 2008 | 5.609 | 2007 | 6.878 | 2006 | 8.951 | 2005 | 10.083 | 2004 | 12.037 | 2003 | 13.733 | 2002 | 18.11 | 2001 | 19.921 | 2000 | 16.218 | 1999 | 14.1 | 1998 | 12.2 | 1997 | 13.7 | 1996 | 12.5 | 1995 | 11.1 | 1994 | 12.8 | 1993 | 16.4 | 1992 | 15.3 | 1991 | 11.1 | 1990 | 1.7 |
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