| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 13.24 | 151 |
| 2015 | 13.1 | 149 |
| 2014 | 11.9 | 142 |
| 2013 | 12.6 | 142 |
| 2012 | 12.2 | 139 |
| 2011 | 12.9 | 142 |
| 2010 | 12.5 | 145 |
| 2009 | 12.9 | 148 |
| 2008 | 12.7 | 153 |
| 2007 | 13.1 | 155 |
| 2006 | 14 | 156 |
| 2005 | 14.8 | 155 |
| 2004 | 12.4 | 143 |
| 2003 | 15.4 | 155 |
| 2002 | 16.2 | 158 |
| 2001 | 15.8 | 159 |
| 2000 | 13.7 | 144 |
| 1999 | 12.74 | 136 |
| 1998 | 13.07 | 139 |
| 1997 | 13.46 | 144 |
| 1996 | 13.7 | 144 |
| 1995 | 14.6 | 148 |
| 1994 | 18.25 | 162 |
| 1993 | 19.7 | 169 |
| 1992 | 17.51 | 161 |
| 1991 | 15.41 | 150 |