| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.31 | 29 |
| 2015 | -2.24 | 132 |
| 2014 | 3.26 | 32 |
| 2013 | 6.43 | 19 |
| 2012 | 1.01 | 97 |
| 2011 | 9.46 | 13 |
| 2010 | 9.31 | 12 |
| 2009 | -7.98 | 144 |
| 2008 | 6 | 36 |
| 2007 | 3.84 | 69 |
| 2006 | 8.1 | 28 |
| 2005 | 13.98 | 8 |
| 2004 | 6.46 | 38 |
| 2003 | 18.83 | 3 |
| 2002 | 6.15 | 33 |
| 2001 | 6.34 | 23 |
| 2000 | 20.86 | 1 |
| 1999 | -7.86 | 122 |
| 1998 | 5.9 | 27 |
| 1997 | 10.31 | 10 |
| 1996 | 19.24 | 4 |