| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.07 | 195 |
| 2015 | 6.5 | 194 |
| 2014 | 6.98 | 193 |
| 2013 | 7.51 | 193 |
| 2012 | 8.1 | 192 |
| 2011 | 8.75 | 193 |
| 2010 | 9.48 | 192 |
| 2009 | 10.26 | 190 |
| 2008 | 11.09 | 190 |
| 2007 | 11.99 | 186 |
| 2006 | 12.94 | 184 |
| 2005 | 14.02 | 181 |
| 2004 | 15.36 | 180 |
| 2003 | 16.8 | 179 |
| 2002 | 18.35 | 175 |
| 2001 | 20.01 | 171 |
| 2000 | 21.35 | 167 |
| 1999 | 21.48 | 167 |
| 1998 | 21.6 | 169 |
| 1997 | 21.73 | 169 |
| 1996 | 21.86 | 170 |
| 1995 | 21.98 | 171 |
| 1994 | 22.12 | 173 |
| 1993 | 22.25 | 173 |
| 1992 | 22.39 | 174 |
| 1991 | 22.53 | 175 |
| 1990 | 22.66 | 175 |
| 1989 | 22.79 | 173 |
| 1988 | 22.91 | 173 |
| 1987 | 23.04 | 173 |
| 1986 | 23.17 | 174 |