| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 20.775 | 5 |
| 2015 | 19.395 | 14 |
| 2014 | 17.212 | 21 |
| 2013 | 15.895 | 26 |
| 2012 | 16.38 | 29 |
| 2011 | 17.15 | 21 |
| 2010 | 18.348 | 21 |
| 2009 | 19.893 | 18 |
| 2008 | 22.371 | 12 |
| 2007 | 17.105 | 28 |
| 2006 | 15.477 | 44 |
| 2005 | 16.809 | 41 |
| 2004 | 18.497 | 31 |
| 2003 | 25.193 | 16 |
| 2002 | 36.578 | 10 |
| 2001 | 22.452 | 31 |
| 2000 | 25.199 | 27 |
| 1999 | 32.126 | 20 |
| 1998 | 46.353 | 13 |
| 1997 | 23.685 | 34 |
| 1996 | 39.413 | 18 |
| 1995 | 39.744 | 21 |
| 1994 | 54.655 | 13 |
| 1993 | 59.902 | 11 |
| 1992 | 41.328 | 12 |
| 1991 | 37.163 | 12 |
| 1990 | 35.532 | 11 |
| 1989 | 22.498 | 19 |
| 1988 | 8.498 | 90 |
| 1987 | 8.472 | 89 |
| 1986 | 8.487 | 91 |