| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.17 | 87 |
| 2015 | 6.92 | 89 |
| 2014 | 10.62 | 68 |
| 2013 | 5.17 | 123 |
| 2012 | 4.35 | 128 |
| 2011 | 9.49 | 93 |
| 2010 | 12.14 | 83 |
| 2009 | 5.68 | 114 |
| 2008 | 11.82 | 104 |
| 2007 | 29.91 | 44 |
| 2006 | 24.81 | 49 |
| 2005 | 15.71 | 78 |
| 2004 | 16.51 | 64 |
| 2003 | 18.5 | 49 |
| 2002 | -8.07 | 155 |
| 2001 | 66.63 | 14 |
| 2000 | 22.25 | 45 |
| 1999 | 31.22 | 22 |
| 1998 | 13.01 | 67 |
| 1997 | 23.9 | 49 |
| 1996 | -.21 | 146 |
| 1995 | 1.82 | 140 |
| 1994 | -55.16 | 147 |