| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 19.585 | 8 |
| 2015 | 23.306 | 7 |
| 2014 | 23.175 | 7 |
| 2013 | 23.28 | 6 |
| 2012 | 26.168 | 7 |
| 2011 | 26.95 | 4 |
| 2010 | 28.875 | 3 |
| 2009 | 31.108 | 3 |
| 2008 | 32.4 | 3 |
| 2007 | 32.4 | 4 |
| 2006 | 29.3 | 8 |
| 2005 | 31.198 | 6 |
| 2004 | 29.77 | 11 |
| 2003 | 29.59 | 12 |
| 2002 | 37.417 | 8 |
| 2001 | 37 | 11 |
| 2000 | 39.667 | 10 |
| 1999 | 40.333 | 14 |
| 1998 | 55.583 | 5 |
| 1997 | 51.5 | 9 |
| 1996 | 38 | 20 |
| 1995 | 52 | 11 |
| 1994 | 30 | 25 |
| 1993 | 37 | 18 |
| 1992 | 37 | 15 |
| 1991 | 37 | 13 |
| 1990 | 20 | 30 |
| 1989 | 20 | 24 |