| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -4.83 | 131 |
| 2015 | 13.24 | 46 |
| 2014 | 16.8 | 24 |
| 2013 | 15.85 | 46 |
| 2012 | 18.36 | 31 |
| 2011 | 10.5 | 83 |
| 2010 | 25.06 | 22 |
| 2009 | 8.21 | 93 |
| 2008 | 36.87 | 11 |
| 2007 | 34.28 | 33 |
| 2006 | 31.45 | 33 |
| 2005 | 45.36 | 7 |
| 2004 | 1.02 | 154 |
| 2003 | 53.83 | 8 |
| 2002 | 25.38 | 36 |
| 2001 | 36.32 | 32 |
| 2000 | 24.88 | 42 |
| 1999 | 7.72 | 122 |
| 1998 | 2.81 | 126 |
| 1997 | 116.44 | 3 |
| 1996 | 84.48 | 5 |