| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9 | 120 |
| 2015 | 9.61 | 126 |
| 2014 | 9.62 | 122 |
| 2013 | 9.38 | 119 |
| 2012 | 10.17 | 126 |
| 2011 | 10.31 | 125 |
| 2010 | 8.92 | 116 |
| 2009 | 7.71 | 94 |
| 2008 | 4.78 | 55 |
| 2007 | 4.49 | 50 |
| 2006 | 5.74 | 64 |
| 2005 | 6.57 | 68 |
| 2004 | 6.39 | 68 |
| 2003 | 6.56 | 68 |
| 2002 | 6.33 | 67 |
| 2001 | 5.91 | 64 |
| 2000 | 5.08 | 54 |
| 1999 | 5.89 | 57 |
| 1998 | 5.33 | 53 |
| 1997 | 5.68 | 59 |
| 1996 | 6.16 | 62 |
| 1995 | 5.18 | 52 |
| 1994 | 4.05 | 40 |
| 1993 | 3.95 | 41 |
| 1992 | 3.93 | 44 |
| 1991 | 5.37 | 59 |