| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 24.34 | 136 |
| 2014 | 23.35 | 136 |
| 2013 | 22.7 | 137 |
| 2012 | 23.87 | 137 |
| 2011 | 24.68 | 137 |
| 2010 | 25.12 | 137 |
| 2009 | 23.27 | 141 |
| 2008 | 22.76 | 140 |
| 2007 | 23.25 | 140 |
| 2006 | 22.17 | 135 |
| 2005 | 22.24 | 129 |
| 2004 | 22.57 | 128 |
| 2003 | 22.95 | 126 |
| 2002 | 22.55 | 124 |
| 2001 | 20.62 | 125 |
| 2000 | 17.14 | 137 |
| 1999 | 16.86 | 132 |
| 1998 | 16.53 | 133 |
| 1997 | 19.71 | 123 |
| 1996 | 21.8 | 110 |
| 1995 | 25.09 | 100 |
| 1994 | 24.78 | 101 |
| 1993 | 24.4 | 102 |
| 1992 | 22.07 | 106 |
| 1991 | 19.8 | 109 |
| 1990 | 19.9 | 107 |
| 1989 | 18.39 | 107 |
| 1988 | 17.43 | 108 |