| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 4.23 | 109 |
| 2014 | 4.52 | 110 |
| 2013 | 4.83 | 111 |
| 2012 | 5.33 | 106 |
| 2011 | 6.89 | 97 |
| 2010 | 6.64 | 100 |
| 2009 | 7.12 | 97 |
| 2008 | 7.51 | 96 |
| 2007 | 7.44 | 96 |
| 2006 | 6.27 | 103 |
| 2005 | 6.06 | 105 |
| 2004 | 7.89 | 96 |
| 2003 | 7.74 | 97 |
| 2002 | 8.77 | 93 |
| 2001 | 9.48 | 89 |
| 2000 | 11.24 | 83 |
| 1999 | 12.39 | 78 |
| 1998 | 13.54 | 77 |
| 1997 | 13.1 | 79 |
| 1996 | 14.59 | 75 |
| 1995 | 12.78 | 84 |
| 1994 | 13.36 | 80 |