| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.96 | 65 |
| 2015 | 5.18 | 43 |
| 2014 | 4.69 | 45 |
| 2013 | 41.17 | 2 |
| 2012 | -19.83 | 177 |
| 2011 | 3.74 | 91 |
| 2010 | 34.24 | 3 |
| 2009 | -17.31 | 175 |
| 2008 | 9.18 | 28 |
| 2007 | 14.34 | 10 |
| 2006 | 3.61 | 78 |
| 2005 | -.12 | 116 |
| 2004 | 3.9 | 82 |
| 2003 | 8.03 | 31 |
| 2002 | 4.16 | 57 |
| 2001 | 11.64 | 16 |
| 2000 | -6.96 | 143 |
| 1999 | 1.25 | 108 |
| 1998 | 1.23 | 91 |
| 1997 | 6.87 | 22 |
| 1996 | -1.32 | 124 |
| 1995 | 11.78 | 17 |
| 1994 | 0.74 | 76 |
| 1993 | 6.15 | 28 |
| 1992 | 5.31 | 39 |