| 时间 | 值 | 世界排名 |
|---|---|---|
| 2016 | 0.2 | 72 |
| 2015 | 0.3 | 139 |
| 2014 | 0.2 | 146 |
| 2013 | 0.2 | 159 |
| 2012 | 0.2 | 162 |
| 2011 | 0.1 | 161 |
| 2010 | 2 | 135 |
| 2009 | 3.8 | 110 |
| 2008 | 2.3 | 107 |
| 2007 | 2 | 128 |
| 2006 | 2.1 | 118 |
| 2005 | 1.9 | 122 |
| 2004 | 2.2 | 112 |
| 2003 | 2.3 | 106 |
| 2002 | 2.3 | 110 |
| 2001 | 2.2 | 96 |
| 2000 | 2.8 | 76 |
| 1999 | 2.7 | 83 |
| 1998 | 2.3 | 87 |
| 1997 | 2.3 | 91 |
| 1996 | 2.4 | 81 |
| 1995 | 2.7 | 65 |
| 1994 | 2.9 | 67 |
| 1993 | 3.7 | 48 |
| 1992 | 3.3 | 49 |