| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 12.03 | 16 |
| 2014 | 15.89 | 8 |
| 2013 | 7.89 | 28 |
| 2012 | 10.1 | 27 |
| 2011 | 4.17 | 80 |
| 2010 | 1.46 | 139 |
| 2009 | 1.5 | 134 |
| 2008 | 2.39 | 134 |
| 2007 | 2.24 | 146 |
| 2006 | 17.09 | 20 |
| 2005 | 2.05 | 120 |
| 2004 | 4.19 | 66 |
| 2003 | 4.26 | 55 |
| 2002 | 1.24 | 123 |
| 2001 | -.89 | 176 |
| 2000 | 2.13 | 106 |
| 1999 | 5.42 | 46 |
| 1998 | -1.3 | 175 |
| 1997 | 71.74 | 2 |
| 1996 | -3.49 | 173 |
| 1995 | -.22 | 164 |
| 1992 | 1.21 | 60 |
| 1991 | 1.19 | 57 |
| 1990 | 1.3 | 51 |