| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 0.1 | 131 |
| 2015 | 0.1 | 134 |
| 2014 | 0.2 | 134 |
| 2013 | 0.6 | 129 |
| 2012 | 0.8 | 126 |
| 2011 | 1.5 | 119 |
| 2010 | 1.3 | 115 |
| 2009 | 2.2 | 107 |
| 2008 | 2.1 | 111 |
| 2007 | 1.2 | 118 |
| 2006 | 1.2 | 117 |
| 2005 | 2 | 109 |
| 2004 | 2.1 | 117 |
| 2003 | 4.8 | 105 |
| 2002 | 6.1 | 104 |
| 2001 | 5.6 | 116 |
| 2000 | 3.7 | 121 |
| 1999 | 6.2 | 116 |
| 1998 | 5.2 | 116 |
| 1997 | 3.2 | 122 |
| 1996 | 1.6 | 128 |
| 1995 | 1.1 | 129 |
| 1994 | 0.7 | 137 |
| 1993 | 0.7 | 138 |