| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.34 | 90 |
| 2015 | 4.73 | 105 |
| 2014 | 5.34 | 104 |
| 2013 | 6.13 | 101 |
| 2012 | 5.32 | 107 |
| 2011 | 7.33 | 96 |
| 2010 | 6.27 | 102 |
| 2009 | 6.04 | 107 |
| 2008 | 6.56 | 101 |
| 2007 | 5.47 | 105 |
| 2006 | 8.74 | 90 |
| 2005 | 9.48 | 89 |
| 2004 | 13.98 | 66 |
| 2003 | 12.92 | 72 |
| 2002 | 12.56 | 75 |
| 2001 | 14.49 | 71 |
| 2000 | 12.02 | 78 |
| 1999 | 14.11 | 74 |
| 1998 | 15.94 | 69 |
| 1997 | 18.72 | 60 |
| 1996 | 18.43 | 62 |
| 1995 | 19.15 | 61 |
| 1994 | 21.54 | 54 |
| 1993 | 22.64 | 48 |
| 1992 | 19.41 | 58 |
| 1991 | 20.13 | 56 |
| 1990 | 23.74 | 49 |