| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 22.64 | 34 |
| 2015 | 22.95 | 58 |
| 2014 | 22.82 | 57 |
| 2013 | 21.19 | 74 |
| 2012 | 21.46 | 73 |
| 2011 | 19.85 | 82 |
| 2010 | 19.24 | 83 |
| 2009 | 17.93 | 91 |
| 2008 | 17.94 | 94 |
| 2007 | 18.16 | 92 |
| 2006 | 18.23 | 92 |
| 2005 | 17.4 | 90 |
| 2004 | 18.8 | 81 |
| 2003 | 19.11 | 69 |
| 2002 | 20.4 | 65 |
| 2001 | 23.3 | 50 |
| 2000 | 24.93 | 43 |
| 1999 | 24.19 | 43 |
| 1998 | 22.52 | 49 |
| 1997 | 22.21 | 47 |
| 1996 | 22.78 | 43 |
| 1995 | 22.28 | 43 |
| 1994 | 23.82 | 39 |
| 1993 | 23.16 | 43 |