| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 12.01 | 148 |
| 2015 | 12.84 | 148 |
| 2014 | 13.17 | 147 |
| 2013 | 13.21 | 146 |
| 2012 | 12.67 | 142 |
| 2011 | 12 | 135 |
| 2010 | 8.98 | 117 |
| 2009 | 9.38 | 124 |
| 2008 | 8.7 | 127 |
| 2007 | 8.8 | 125 |
| 2006 | 10.49 | 136 |
| 2005 | 11.2 | 138 |
| 2004 | 10.3 | 125 |
| 2003 | 11 | 125 |
| 2002 | 10.01 | 117 |
| 2001 | 9.26 | 115 |
| 2000 | 9 | 106 |
| 1999 | 7.95 | 94 |
| 1998 | 8.03 | 94 |
| 1997 | 8.4 | 97 |
| 1996 | 9 | 103 |
| 1995 | 11.3 | 132 |
| 1994 | 11 | 126 |
| 1993 | 10.9 | 124 |
| 1992 | 9 | 109 |
| 1991 | 9.6 | 117 |