| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2012 | 0 | 177 |
| 2011 | 0 | 178 |
| 2010 | 0 | 179 |
| 2009 | 0 | 176 |
| 2008 | 0 | 177 |
| 2007 | 0 | 178 |
| 2006 | 0 | 177 |
| 2005 | 0 | 174 |
| 2004 | 0 | 174 |
| 2003 | 0 | 173 |
| 2002 | 0 | 172 |
| 2001 | 0 | 171 |
| 2000 | 0 | 170 |
| 1999 | 0 | 163 |
| 1998 | 0 | 163 |
| 1997 | 0 | 164 |
| 1996 | 0 | 162 |
| 1995 | 0 | 162 |
| 1994 | 0 | 144 |
| 1993 | 0 | 139 |
| 1992 | 0 | 136 |
| 1991 | 0 | 133 |