Year | |
---|---|
1992 | 14.0 |
1993 | 13.5 |
1994 | 13.3 |
1995 | 12.9 |
1996 | 12.3 |
1997 | 11.7 |
1998 | 11.4 |
1999 | 11.1 |
2000 | 10.7 |
2001 | 10.8 |
2002 | 10.5 |
2003 | 10.6 |
2004 | 10.6 |
2005 | 10.6 |
2006 | 10.9 |
2007 | 11.2 |
2008 | 11.4 |
2009 | 11.3 |
2010 | 11.1 |
2011 | 11.0 |
2012 | 11.0 |
2013 | 10.9 |
2014 | 10.9 |
2015 | 10.9 |