| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.94 | 77 |
| 2015 | 6.67 | 87 |
| 2014 | 5.85 | 70 |
| 2013 | 5.85 | 70 |
| 2012 | 5.14 | 55 |
| 2011 | 4.9 | 52 |
| 2010 | 4.36 | 40 |
| 2009 | 5.12 | 48 |
| 2008 | 5.06 | 58 |
| 2007 | 4.07 | 46 |
| 2006 | 4.73 | 52 |
| 2005 | 4.49 | 43 |
| 2004 | 5.11 | 51 |
| 2003 | 3.67 | 28 |
| 2002 | 2.62 | 17 |
| 2001 | 1.8 | 12 |
| 2000 | 2.35 | 18 |
| 1999 | 2.39 | 17 |
| 1998 | 2.76 | 20 |
| 1997 | 2.53 | 20 |
| 1996 | 3.29 | 28 |
| 1995 | 2.92 | 24 |
| 1994 | 3.48 | 32 |
| 1993 | 2.33 | 16 |
| 1992 | 2.03 | 12 |
| 1991 | 1.48 | 12 |