| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2014 | 6 | 107 |
| 2013 | 6 | 112 |
| 2012 | 6 | 116 |
| 2011 | 6 | 116 |
| 2010 | 6 | 118 |
| 2009 | 6 | 122 |
| 2008 | 6 | 132 |
| 2007 | 6 | 146 |
| 2006 | 6.333 | 136 |
| 2005 | 6.125 | 132 |
| 2004 | 6.083 | 129 |
| 2003 | 7 | 117 |
| 2002 | 7 | 124 |
| 2001 | 7 | 131 |
| 2000 | 7 | 135 |
| 1999 | 7 | 132 |
| 1993 | 7 | 114 |
| 1992 | 7 | 108 |
| 1991 | 7 | 106 |
| 1990 | 7 | 102 |
| 1989 | 7 | 102 |
| 1988 | 7 | 99 |
| 1987 | 7 | 99 |
| 1986 | 7 | 98 |