| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 23.29 | 153 |
| 2015 | 22.76 | 155 |
| 2014 | 21.51 | 160 |
| 2013 | 22.37 | 156 |
| 2012 | 22.12 | 156 |
| 2011 | 20.78 | 162 |
| 2010 | 21.49 | 165 |
| 2009 | 26.97 | 141 |
| 2008 | 24.53 | 156 |
| 2007 | 22.77 | 164 |
| 2006 | 23.76 | 158 |
| 2005 | 24.99 | 155 |
| 2004 | 23.42 | 165 |
| 2003 | 26.98 | 151 |
| 2002 | 32.24 | 131 |
| 2001 | 32.07 | 136 |
| 2000 | 31.84 | 136 |
| 1999 | 30.9 | 143 |
| 1998 | 32.49 | 138 |
| 1997 | 34.12 | 134 |
| 1996 | 36.46 | 118 |
| 1995 | 37.84 | 112 |
| 1994 | 42.25 | 89 |
| 1993 | 45.3 | 66 |
| 1992 | 48.6 | 54 |
| 1991 | 51.67 | 47 |