| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 3.88 | 114 |
| 2014 | 3.98 | 115 |
| 2013 | 3.97 | 117 |
| 2012 | 3.89 | 117 |
| 2011 | 3.65 | 122 |
| 2010 | 3.65 | 122 |
| 2009 | 3.97 | 122 |
| 2008 | 3.87 | 123 |
| 2007 | 3.95 | 123 |
| 2006 | 3.44 | 129 |
| 2005 | 4.41 | 118 |
| 2004 | 5.53 | 115 |
| 2003 | 5.81 | 115 |
| 2002 | 6 | 115 |
| 2001 | 6.46 | 110 |
| 2000 | 6.69 | 105 |
| 1999 | 6.21 | 108 |
| 1998 | 6.2 | 110 |
| 1997 | 7.28 | 104 |
| 1996 | 7.24 | 104 |
| 1995 | 8.77 | 100 |
| 1994 | 9.59 | 90 |
| 1993 | 10.27 | 87 |
| 1992 | 13.13 | 75 |
| 1991 | 13.31 | 77 |
| 1990 | 13.99 | 76 |
| 1989 | 13.68 | 72 |
| 1988 | 13.88 | 69 |
| 1987 | 13.7 | 68 |
| 1986 | 13.64 | 66 |