| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 17.29 | 40 |
| 2015 | 18.23 | 42 |
| 2014 | 18.49 | 45 |
| 2013 | 18.27 | 49 |
| 2012 | 19.52 | 44 |
| 2011 | 20.87 | 42 |
| 2010 | 18.73 | 47 |
| 2009 | 17.59 | 50 |
| 2008 | 17.85 | 50 |
| 2007 | 18.19 | 53 |
| 2006 | 17.56 | 54 |
| 2005 | 18.56 | 56 |
| 2004 | 18.18 | 55 |
| 2003 | 17.7 | 54 |
| 2002 | 18.6 | 53 |
| 2001 | 18.97 | 54 |
| 2000 | 20.27 | 52 |
| 1999 | 19.45 | 54 |
| 1998 | 22 | 51 |
| 1997 | 22.7 | 47 |
| 1996 | 24.15 | 46 |
| 1995 | 22.59 | 50 |
| 1994 | 21.34 | 55 |