| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.74 | 37 |
| 2015 | 2.84 | 51 |
| 2014 | 1.69 | 77 |
| 2013 | 0.48 | 107 |
| 2012 | -1.35 | 130 |
| 2011 | 0.06 | 113 |
| 2010 | 0.71 | 109 |
| 2009 | -1.22 | 94 |
| 2008 | 2.05 | 78 |
| 2007 | 3.53 | 78 |
| 2006 | 3.5 | 69 |
| 2005 | 3.11 | 79 |
| 2004 | 3.44 | 76 |
| 2003 | 4.79 | 43 |
| 2002 | 3.12 | 54 |
| 2001 | 3.2 | 42 |
| 2000 | 1.89 | 75 |
| 1999 | 3.04 | 51 |
| 1998 | -.55 | 105 |
| 1997 | 2.96 | 58 |
| 1996 | 7.56 | 23 |
| 1995 | 4.71 | 32 |
| 1994 | 4.14 | 29 |
| 1993 | 1.14 | 59 |
| 1992 | 8.7 | 8 |
| 1991 | -21.24 | 105 |