| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.09 | 33 |
| 2015 | -2.9 | 179 |
| 2014 | 6.42 | 44 |
| 2013 | 4.3 | 61 |
| 2012 | 7.76 | 41 |
| 2011 | 4.83 | 69 |
| 2010 | 13.3 | 22 |
| 2009 | 9.49 | 28 |
| 2008 | 7.74 | 58 |
| 2007 | 15.42 | 24 |
| 2006 | 13.04 | 30 |
| 2005 | 22.33 | 7 |
| 2004 | 9.01 | 24 |
| 2003 | 10.55 | 19 |
| 2002 | 4.62 | 51 |
| 2001 | 9.49 | 17 |
| 2000 | 7.32 | 30 |
| 1999 | 5.33 | 48 |
| 1998 | 10.33 | 15 |
| 1997 | 5.25 | 32 |
| 1996 | 3.17 | 43 |
| 1995 | 4.61 | 32 |