| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 13.9 | 7 |
| 2015 | 48.72 | 3 |
| 2014 | 12.19 | 9 |
| 2013 | -.28 | 172 |
| 2012 | 0.56 | 172 |
| 2011 | 7.96 | 50 |
| 2010 | 9.38 | 19 |
| 2009 | 15.89 | 5 |
| 2008 | 25.23 | 9 |
| 2007 | 12.84 | 13 |
| 2006 | 9.06 | 36 |
| 2005 | 13.57 | 17 |
| 2004 | 9.05 | 35 |
| 2003 | 5.18 | 66 |
| 2002 | 0.76 | 145 |
| 2001 | 11.96 | 22 |
| 2000 | 28.2 | 12 |
| 1999 | 22.68 | 18 |
| 1998 | 10.58 | 43 |
| 1997 | 15.94 | 32 |
| 1996 | 80.33 | 8 |
| 1995 | 376.75 | 6 |
| 1994 | 891.19 | 8 |
| 1993 | 4734.91 | 1 |