| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 30.95 | 153 |
| 2015 | 34.45 | 160 |
| 2014 | 34.49 | 168 |
| 2013 | 37.56 | 165 |
| 2012 | 42.01 | 157 |
| 2011 | 45.85 | 149 |
| 2010 | 37.97 | 163 |
| 2009 | 32.87 | 169 |
| 2008 | 39.55 | 166 |
| 2007 | 34.77 | 176 |
| 2006 | 32.84 | 179 |
| 2005 | 29.33 | 178 |
| 2004 | 32.79 | 170 |
| 2003 | 28.66 | 177 |
| 2002 | 24.43 | 179 |
| 2001 | 24.69 | 173 |
| 2000 | 22.17 | 176 |
| 1999 | 21.64 | 175 |
| 1998 | 21.85 | 176 |
| 1997 | 27.2 | 163 |
| 1996 | 33.43 | 152 |
| 1995 | 44.85 | 115 |
| 1994 | 44.85 | 100 |
| 1993 | 45.73 | 89 |
| 1992 | 41.86 | 100 |
| 1991 | 37.83 | 97 |
| 1990 | 31.89 | 123 |
| 1989 | 30.65 | 122 |
| 1988 | 21.53 | 137 |