| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 33.53 | 107 |
| 2015 | 35.46 | 122 |
| 2014 | 31.99 | 125 |
| 2013 | 30.74 | 127 |
| 2012 | 29.32 | 129 |
| 2011 | 36.36 | 110 |
| 2010 | 38.26 | 104 |
| 2009 | 25.31 | 137 |
| 2008 | 22.72 | 141 |
| 2007 | 19.65 | 151 |
| 2006 | 25.76 | 124 |
| 2005 | 18.69 | 143 |
| 2004 | 18.39 | 138 |
| 2003 | 16.07 | 144 |
| 2002 | 14.16 | 151 |
| 2001 | 12.5 | 152 |
| 2000 | 11.68 | 152 |
| 1998 | 9.97 | 152 |
| 1997 | 10.02 | 150 |
| 1996 | 9.04 | 152 |
| 1995 | 9.26 | 150 |
| 1994 | 9.22 | 142 |
| 1993 | 10.07 | 139 |
| 1992 | 8.68 | 135 |
| 1991 | 9.17 | 131 |