| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.3 | 87 |
| 2015 | 1.25 | 136 |
| 2014 | 2.321 | 117 |
| 2013 | 1.945 | 128 |
| 2012 | 6.304 | 49 |
| 2011 | 6.191 | 53 |
| 2010 | 2.929 | 114 |
| 2009 | 3.672 | 54 |
| 2008 | 4.428 | 84 |
| 2007 | 7.004 | 80 |
| 2006 | 5.487 | 91 |
| 2005 | 6.442 | 65 |
| 2004 | 5.646 | 76 |
| 2003 | 4.522 | 75 |
| 2002 | 2.443 | 110 |
| 2001 | 6.081 | 34 |
| 2000 | 5.369 | 56 |
| 1999 | 5.274 | 47 |
| 1998 | 4.314 | 67 |
| 1997 | 1.719 | 125 |
| 1996 | 3.287 | 88 |
| 1995 | 1.629 | 96 |
| 1994 | 3.608 | 64 |
| 1993 | 0.305 | 97 |
| 1992 | 4.957 | 45 |
| 1991 | 4.85 | 40 |
| 1990 | 3.394 | 63 |
| 1989 | 4.588 | 45 |
| 1988 | 6.558 | 28 |
| 1987 | 3.23 | 69 |
| 1986 | 3.792 | 51 |