| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 7.8 | 192 |
| 2015 | 7.86 | 192 |
| 2014 | 7.92 | 192 |
| 2013 | 7.99 | 192 |
| 2012 | 8.05 | 193 |
| 2011 | 8.11 | 194 |
| 2010 | 8.18 | 194 |
| 2009 | 8.24 | 194 |
| 2008 | 8.3 | 194 |
| 2007 | 8.36 | 194 |
| 2006 | 8.42 | 194 |
| 2005 | 8.48 | 194 |
| 2004 | 8.54 | 194 |
| 2003 | 8.61 | 194 |
| 2002 | 8.67 | 193 |
| 2001 | 8.73 | 193 |
| 2000 | 8.8 | 193 |
| 1999 | 8.86 | 193 |
| 1998 | 8.93 | 193 |
| 1997 | 8.99 | 193 |
| 1996 | 9.06 | 195 |
| 1995 | 9.13 | 195 |
| 1994 | 9.23 | 195 |
| 1993 | 9.33 | 195 |
| 1992 | 9.44 | 196 |
| 1991 | 9.54 | 196 |
| 1990 | 9.64 | 195 |
| 1989 | 9.75 | 193 |
| 1988 | 9.85 | 194 |
| 1987 | 9.96 | 195 |
| 1986 | 10.06 | 197 |