| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 27.15 | 114 |
| 2015 | 22.29 | 139 |
| 2014 | 19.94 | 144 |
| 2013 | 20.95 | 141 |
| 2012 | 19.61 | 146 |
| 2011 | 19.73 | 147 |
| 2010 | 18.04 | 153 |
| 2009 | 18.22 | 151 |
| 2008 | 15.09 | 161 |
| 2007 | 21.3 | 146 |
| 2006 | 16.21 | 157 |
| 2005 | 14.45 | 159 |
| 2004 | 10.57 | 161 |
| 2003 | 9.67 | 162 |
| 2002 | 8.68 | 160 |
| 2001 | 7.87 | 159 |
| 2000 | 8.26 | 157 |
| 1999 | 6.72 | 158 |
| 1998 | 7.08 | 157 |