| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.59 | 24 |
| 2015 | 18.31 | 5 |
| 2014 | 12.86 | 7 |
| 2013 | -7.57 | 165 |
| 2012 | 0.82 | 112 |
| 2011 | 12.13 | 22 |
| 2010 | 4.29 | 96 |
| 2009 | -26.13 | 174 |
| 2008 | 9.52 | 25 |
| 2007 | 22.53 | 6 |
| 2006 | 10.27 | 40 |
| 2005 | 10.35 | 29 |
| 2004 | 31.09 | 3 |
| 2003 | 15.09 | 16 |
| 2002 | 5.69 | 57 |
| 2001 | 10.98 | 20 |
| 2000 | -3.34 | 144 |
| 1999 | 12.88 | 13 |
| 1998 | 20.87 | 4 |
| 1997 | 23.08 | 5 |
| 1996 | 0.39 | 117 |