| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.14 | 95 |
| 2015 | 5.84 | 36 |
| 2014 | 3.73 | 58 |
| 2013 | -1.62 | 135 |
| 2012 | 3.34 | 72 |
| 2011 | 7.37 | 30 |
| 2010 | 5.49 | 44 |
| 2009 | 8.23 | 47 |
| 2008 | 7.48 | 39 |
| 2007 | 1.17 | 120 |
| 2006 | 5.85 | 55 |
| 2005 | 11.22 | 18 |
| 2004 | 34.55 | 3 |
| 2003 | -.28 | 121 |
| 2002 | -15.28 | 145 |
| 2001 | 1.03 | 111 |
| 2000 | 6.88 | 29 |
| 1999 | 9.7 | 18 |
| 1998 | 11.5 | 20 |
| 1997 | 12.98 | 16 |
| 1996 | 19.4 | 11 |
| 1995 | 12.44 | 6 |