| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 12.63 | 149 |
| 2015 | 12.03 | 146 |
| 2014 | 13.9 | 152 |
| 2013 | 14.3 | 151 |
| 2012 | 14.5 | 153 |
| 2011 | 15.7 | 160 |
| 2010 | 16.1 | 160 |
| 2009 | 15 | 160 |
| 2008 | 11.48 | 151 |
| 2007 | 10.93 | 144 |
| 2006 | 11.01 | 141 |
| 2005 | 11.35 | 141 |
| 2004 | 10.31 | 126 |
| 2003 | 11.78 | 137 |
| 2002 | 11.94 | 135 |
| 2001 | 11.34 | 132 |
| 2000 | 10.08 | 116 |
| 1999 | 11.81 | 130 |
| 1998 | 13.46 | 145 |
| 1997 | 13.8 | 147 |
| 1996 | 13.64 | 143 |
| 1995 | 13.93 | 146 |
| 1994 | 14.56 | 144 |
| 1993 | 16.91 | 156 |
| 1992 | 16.93 | 158 |
| 1991 | 16.18 | 156 |