| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 13.45 | 49 |
| 2015 | 13.49 | 58 |
| 2014 | 13.34 | 58 |
| 2013 | 13.36 | 60 |
| 2012 | 13.37 | 58 |
| 2011 | 13.51 | 58 |
| 2010 | 13.93 | 56 |
| 2009 | 15.29 | 52 |
| 2008 | 14.48 | 54 |
| 2007 | 13.72 | 58 |
| 2006 | 12.97 | 66 |
| 2005 | 13.13 | 67 |
| 2004 | 14.34 | 64 |
| 2003 | 15.19 | 62 |
| 2002 | 15.46 | 57 |
| 2001 | 15.29 | 64 |
| 2000 | 15.6 | 66 |
| 1999 | 19.61 | 53 |
| 1998 | 18.08 | 61 |
| 1997 | 16.09 | 71 |
| 1996 | 16.67 | 70 |
| 1995 | 17.14 | 66 |
| 1994 | 17.29 | 64 |
| 1993 | 17.88 | 63 |
| 1992 | 19.52 | 57 |
| 1991 | 19.59 | 58 |
| 1990 | 21.55 | 53 |
| 1989 | 23.43 | 44 |
| 1988 | 24.12 | 43 |
| 1987 | 23.33 | 45 |