| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.851 | 88 |
| 2015 | 5.789 | 100 |
| 2014 | 5.761 | 112 |
| 2013 | 6.105 | 110 |
| 2012 | 6.968 | 107 |
| 2011 | 7.466 | 102 |
| 2010 | 7.49 | 107 |
| 2009 | 7.853 | 110 |
| 2008 | 7.997 | 115 |
| 2007 | 9.006 | 103 |
| 2006 | 7.35 | 129 |
| 2005 | 6.78 | 125 |
| 2004 | 7.169 | 118 |
| 2003 | 7.602 | 110 |
| 2002 | 8.053 | 113 |
| 2001 | 8.344 | 118 |
| 2000 | 8.398 | 122 |
| 1999 | 8.766 | 120 |
| 1998 | 9.637 | 116 |
| 1997 | 11.027 | 103 |
| 1996 | 11.138 | 101 |
| 1995 | 11.238 | 96 |
| 1994 | 11.442 | 83 |
| 1993 | 11.889 | 80 |