| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 17.27 | 182 |
| 2014 | 22.19 | 184 |
| 2013 | 25.91 | 181 |
| 2012 | 27.03 | 182 |
| 2011 | 29.98 | 182 |
| 2010 | 25.51 | 186 |
| 2009 | 20.47 | 187 |
| 2008 | 31.79 | 182 |
| 2007 | 25.37 | 187 |
| 2006 | 25.44 | 186 |
| 2005 | 24.39 | 183 |
| 2004 | 20.8 | 190 |
| 2003 | 17.72 | 187 |
| 2002 | 16.66 | 188 |
| 2001 | 20.52 | 180 |
| 2000 | 21.33 | 178 |
| 1999 | 20.66 | 178 |
| 1998 | 22.18 | 175 |
| 1997 | 22.86 | 171 |
| 1996 | 20.87 | 177 |
| 1995 | 14.54 | 180 |
| 1994 | 12.09 | 177 |
| 1993 | 11.18 | 161 |
| 1992 | 14.04 | 158 |
| 1991 | 22.21 | 142 |
| 1990 | 33.86 | 115 |
| 1989 | 47.66 | 80 |
| 1988 | 47.7 | 76 |
| 1987 | 51.61 | 64 |
| 1986 | 63.86 | 39 |