| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.85 | 48 |
| 2015 | 2.11 | 45 |
| 2014 | 1.66 | 65 |
| 2013 | 1.58 | 69 |
| 2012 | 1.55 | 67 |
| 2011 | 1.5 | 69 |
| 2010 | 1.49 | 77 |
| 2009 | 1.31 | 99 |
| 2008 | 0.8 | 130 |
| 2007 | 0.91 | 118 |
| 2006 | 1.04 | 115 |
| 2005 | 1.13 | 116 |
| 2004 | 1.3 | 109 |
| 2003 | 1.45 | 96 |
| 2002 | 1.52 | 86 |
| 2001 | 1.77 | 72 |
| 2000 | 2.21 | 55 |
| 1999 | 2.51 | 49 |
| 1998 | 2.66 | 44 |
| 1997 | 3 | 37 |
| 1996 | 3.24 | 31 |
| 1995 | 3.58 | 28 |
| 1994 | 3.84 | 23 |
| 1993 | 1.76 | 94 |