| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.27 | 26 |
| 2015 | 5.23 | 27 |
| 2014 | 5.18 | 25 |
| 2013 | 5.13 | 22 |
| 2012 | 5.07 | 20 |
| 2011 | 5.02 | 20 |
| 2010 | 4.97 | 18 |
| 2009 | 4.94 | 15 |
| 2008 | 4.91 | 14 |
| 2007 | 4.9 | 14 |
| 2006 | 4.88 | 14 |
| 2005 | 4.84 | 12 |
| 2004 | 4.81 | 11 |
| 2003 | 4.76 | 9 |
| 2002 | 4.7 | 9 |
| 2001 | 4.63 | 9 |
| 2000 | 4.55 | 8 |
| 1999 | 4.49 | 7 |
| 1998 | 4.44 | 8 |
| 1997 | 4.4 | 8 |
| 1996 | 4.36 | 8 |
| 1995 | 4.33 | 9 |
| 1994 | 4.31 | 8 |
| 1993 | 4.31 | 7 |
| 1992 | 4.31 | 7 |
| 1991 | 4.32 | 8 |
| 1990 | 4.32 | 7 |