| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.43 | 194 |
| 2015 | 6.4 | 195 |
| 2014 | 6.36 | 194 |
| 2013 | 6.32 | 194 |
| 2012 | 6.28 | 194 |
| 2011 | 6.23 | 196 |
| 2010 | 6.18 | 196 |
| 2009 | 6.12 | 196 |
| 2008 | 6.06 | 197 |
| 2007 | 6 | 198 |
| 2006 | 5.94 | 201 |
| 2005 | 5.89 | 201 |
| 2004 | 5.83 | 201 |
| 2003 | 5.78 | 201 |
| 2002 | 5.72 | 201 |
| 2001 | 5.67 | 201 |
| 2000 | 5.61 | 201 |
| 1999 | 5.7 | 201 |
| 1998 | 5.84 | 201 |
| 1997 | 5.98 | 201 |
| 1996 | 6.12 | 201 |
| 1995 | 6.27 | 201 |
| 1994 | 6.42 | 200 |
| 1993 | 6.58 | 200 |
| 1992 | 6.73 | 200 |
| 1991 | 6.89 | 200 |
| 1990 | 7.06 | 201 |
| 1989 | 8.08 | 198 |
| 1988 | 9.59 | 197 |
| 1987 | 11.34 | 193 |
| 1986 | 13.36 | 191 |