| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 9 | 86 |
| 2015 | 9.9 | 85 |
| 2014 | 8.8 | 89 |
| 2013 | 8 | 89 |
| 2012 | 12.3 | 83 |
| 2011 | 17.4 | 77 |
| 2010 | 11.2 | 83 |
| 2009 | 6.9 | 91 |
| 2008 | 8.8 | 92 |
| 2007 | 8.7 | 91 |
| 2006 | 10.7 | 88 |
| 2005 | 25.3 | 75 |
| 2004 | 24.4 | 80 |
| 2003 | 24.5 | 79 |
| 2002 | 14.9 | 90 |
| 2001 | 13.6 | 94 |
| 2000 | 15.3 | 94 |
| 1999 | 19.8 | 87 |
| 1998 | 43 | 72 |
| 1997 | 47.1 | 67 |
| 1996 | 46.6 | 64 |
| 1995 | 48.9 | 63 |
| 1994 | 28.4 | 72 |
| 1993 | 10.1 | 101 |
| 1992 | 6.8 | 108 |
| 1991 | 5 | 105 |
| 1990 | 8.4 | 104 |
| 1989 | 8.4 | 103 |
| 1988 | 8.3 | 102 |
| 1987 | 25.5 | 68 |
| 1986 | 27.8 | 61 |