| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 31.6 | 173 |
| 2014 | 39.27 | 174 |
| 2013 | 44.32 | 173 |
| 2012 | 45.87 | 168 |
| 2011 | 46.96 | 174 |
| 2010 | 40.29 | 177 |
| 2009 | 32.91 | 183 |
| 2008 | 44.92 | 173 |
| 2007 | 37.97 | 180 |
| 2006 | 37.19 | 180 |
| 2005 | 39.36 | 174 |
| 2004 | 31.31 | 182 |
| 2003 | 26.59 | 185 |
| 2002 | 24.73 | 183 |
| 2001 | 29.36 | 173 |
| 2000 | 31.08 | 169 |
| 1999 | 31.87 | 169 |
| 1998 | 32.5 | 169 |
| 1997 | 32.75 | 169 |
| 1996 | 32.63 | 167 |
| 1995 | 29.31 | 168 |
| 1994 | 27.78 | 165 |
| 1993 | 28.92 | 153 |
| 1992 | 35.15 | 144 |
| 1991 | 51 | 105 |
| 1990 | 71.11 | 67 |
| 1989 | 75.93 | 57 |
| 1988 | 75.14 | 54 |
| 1987 | 76.82 | 51 |
| 1986 | 75.51 | 51 |