| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 7.5 | 193 |
| 2015 | 7.81 | 193 |
| 2014 | 8.15 | 191 |
| 2013 | 8.52 | 191 |
| 2012 | 8.91 | 190 |
| 2011 | 9.33 | 191 |
| 2010 | 9.77 | 191 |
| 2009 | 10.23 | 191 |
| 2008 | 10.71 | 191 |
| 2007 | 11.2 | 190 |
| 2006 | 11.72 | 188 |
| 2005 | 12.26 | 186 |
| 2004 | 12.81 | 186 |
| 2003 | 13.39 | 185 |
| 2002 | 13.99 | 184 |
| 2001 | 14.64 | 183 |
| 2000 | 15.45 | 182 |
| 1999 | 16.3 | 181 |
| 1998 | 17.19 | 180 |
| 1997 | 18.11 | 180 |
| 1996 | 19.07 | 177 |
| 1995 | 20.07 | 177 |
| 1994 | 21.11 | 177 |
| 1993 | 22.19 | 174 |
| 1992 | 23.31 | 172 |
| 1991 | 24.46 | 169 |
| 1990 | 25.66 | 167 |
| 1989 | 27.28 | 160 |
| 1988 | 29.01 | 157 |
| 1987 | 30.8 | 154 |
| 1986 | 32.66 | 152 |