| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 17.48 | 20 |
| 2015 | 10.84 | 61 |
| 2014 | 8.34 | 87 |
| 2013 | 14.78 | 50 |
| 2012 | 19.47 | 28 |
| 2011 | 23.66 | 20 |
| 2010 | 11.83 | 85 |
| 2009 | 15.15 | 60 |
| 2008 | 2.38 | 151 |
| 2007 | 42.33 | 15 |
| 2006 | 32.88 | 31 |
| 2005 | 27.84 | 34 |
| 2004 | 22.29 | 41 |
| 2003 | 10.35 | 96 |
| 2002 | 33.98 | 20 |
| 2001 | 4.28 | 139 |
| 2000 | 38.55 | 25 |
| 1999 | 13.97 | 73 |
| 1998 | 36.71 | 12 |
| 1997 | 29.2 | 29 |
| 1996 | 35.08 | 27 |
| 1995 | 64.29 | 12 |
| 1994 | 740.36 | 4 |
| 1993 | 1076.77 | 4 |