| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 43.02 | 90 |
| 2015 | 36.88 | 117 |
| 2014 | 34.67 | 116 |
| 2013 | 33.92 | 119 |
| 2012 | 31.56 | 119 |
| 2011 | 29.83 | 125 |
| 2010 | 26.34 | 133 |
| 2009 | 25.94 | 134 |
| 2008 | 19.84 | 149 |
| 2007 | 21.95 | 142 |
| 2006 | 18.29 | 150 |
| 2005 | 16.3 | 152 |
| 2004 | 14.99 | 153 |
| 2003 | 14.39 | 148 |
| 2002 | 15.55 | 144 |
| 2001 | 13.45 | 148 |
| 2000 | 14.7 | 147 |
| 1999 | 11.08 | 151 |
| 1998 | 10.05 | 151 |
| 1997 | 8.73 | 152 |
| 1996 | 8.22 | 153 |
| 1995 | 7.71 | 153 |
| 1994 | 13.1 | 134 |
| 1993 | 69.11 | 25 |
| 1992 | 79.87 | 15 |