| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.023 | 35 |
| 2015 | 5.106 | 44 |
| 2014 | 4.474 | 72 |
| 2013 | 4.572 | 74 |
| 2012 | 5.37 | 62 |
| 2011 | 4.925 | 77 |
| 2010 | 5.482 | 74 |
| 2009 | 2.535 | 69 |
| 2008 | 7.108 | 46 |
| 2007 | 8.072 | 65 |
| 2006 | 6.825 | 71 |
| 2005 | 4.288 | 103 |
| 2004 | 4.481 | 99 |
| 2003 | 3.946 | 89 |
| 2002 | 4.035 | 78 |
| 2001 | 3.669 | 86 |
| 2000 | 3.927 | 101 |
| 1999 | 5.23 | 49 |
| 1998 | 5.137 | 46 |
| 1997 | 4.283 | 81 |
| 1996 | 1.334 | 127 |
| 1995 | 2.508 | 87 |
| 1994 | 4.159 | 54 |
| 1993 | 5.741 | 40 |
| 1992 | 6.842 | 27 |
| 1991 | 2.061 | 69 |
| 1990 | 4.489 | 46 |
| 1989 | 4.788 | 41 |
| 1988 | 3.762 | 56 |
| 1987 | 5.762 | 37 |
| 1986 | 5.387 | 30 |