| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.22 | 15 |
| 2015 | 5.33 | 16 |
| 2014 | 5.33 | 17 |
| 2013 | 5.67 | 18 |
| 2012 | 5.58 | 24 |
| 2011 | 5.38 | 38 |
| 2010 | 4.34 | 59 |
| 2009 | -1.4 | 99 |
| 2008 | 5.12 | 46 |
| 2007 | 8.58 | 25 |
| 2006 | 9.09 | 19 |
| 2005 | 11.49 | 10 |
| 2004 | 8.56 | 22 |
| 2003 | 6.66 | 31 |
| 2002 | 4.62 | 38 |
| 2001 | 5.97 | 24 |
| 2000 | 6.36 | 32 |
| 1999 | 9.22 | 11 |
| 1998 | 2.28 | 103 |
| 1997 | 2.67 | 98 |
| 1996 | 2.28 | 105 |
| 1995 | 3.06 | 71 |
| 1994 | 5.43 | 27 |