| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.09 | 16 |
| 2015 | 4.24 | 26 |
| 2014 | 2.79 | 44 |
| 2013 | 4.03 | 45 |
| 2012 | 2.95 | 58 |
| 2011 | 8.68 | 17 |
| 2010 | 7.11 | 25 |
| 2009 | -1.66 | 101 |
| 2008 | 11.09 | 12 |
| 2007 | 2.3 | 95 |
| 2006 | 5.34 | 49 |
| 2005 | 10.45 | 19 |
| 2004 | 10.37 | 17 |
| 2003 | 6.09 | 33 |
| 2002 | 6.64 | 31 |
| 2001 | 0.21 | 102 |
| 2000 | 2.66 | 64 |
| 1999 | 3.56 | 43 |
| 1998 | 7.48 | 18 |
| 1997 | -4.55 | 116 |
| 1996 | 6.21 | 32 |
| 1995 | 4.68 | 33 |
| 1994 | 1.44 | 60 |