| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.95 | 118 |
| 2015 | 2.71 | 103 |
| 2014 | 2.12 | 127 |
| 2013 | 2.63 | 113 |
| 2012 | 4.01 | 83 |
| 2011 | 6.38 | 47 |
| 2010 | -3.79 | 193 |
| 2009 | -14.33 | 197 |
| 2008 | -3.61 | 194 |
| 2007 | 9.95 | 26 |
| 2006 | 11.89 | 13 |
| 2005 | 10.7 | 16 |
| 2004 | 8.34 | 34 |
| 2003 | 8.43 | 31 |
| 2002 | 7.1 | 23 |
| 2001 | 6.46 | 27 |
| 2000 | 5.41 | 67 |
| 1999 | 2.62 | 121 |
| 1998 | 6.52 | 37 |
| 1997 | 8.97 | 20 |
| 1996 | 2.36 | 136 |