| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9.97 | 127 |
| 2015 | 10.36 | 132 |
| 2014 | 10.31 | 128 |
| 2013 | 10.35 | 129 |
| 2012 | 9.81 | 121 |
| 2011 | 9.25 | 121 |
| 2010 | 9.3 | 124 |
| 2009 | 9.15 | 116 |
| 2008 | 7.48 | 109 |
| 2007 | 8.05 | 111 |
| 2006 | 8.94 | 119 |
| 2005 | 8.95 | 114 |
| 2004 | 9.4 | 115 |
| 2003 | 8.79 | 104 |
| 2002 | 9.17 | 105 |
| 2001 | 9.11 | 107 |
| 2000 | 10.74 | 119 |
| 1999 | 12.51 | 135 |
| 1998 | 12.61 | 137 |
| 1997 | 13.06 | 140 |
| 1996 | 12.85 | 138 |
| 1995 | 12.04 | 137 |
| 1994 | 12.59 | 136 |
| 1993 | 11.32 | 128 |
| 1992 | 10.2 | 121 |
| 1991 | 9.13 | 113 |