| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 18.29 | 139 |
| 2015 | 17.73 | 140 |
| 2014 | 17.33 | 140 |
| 2013 | 17.03 | 140 |
| 2012 | 16.81 | 141 |
| 2011 | 16.63 | 143 |
| 2010 | 16.45 | 144 |
| 2009 | 16.36 | 144 |
| 2008 | 16.29 | 144 |
| 2007 | 16.22 | 144 |
| 2006 | 16.13 | 144 |
| 2005 | 16 | 144 |
| 2004 | 15.8 | 144 |
| 2003 | 15.57 | 144 |
| 2002 | 15.29 | 143 |
| 2001 | 14.99 | 142 |
| 2000 | 14.67 | 142 |
| 1999 | 14.4 | 142 |
| 1998 | 14.12 | 141 |
| 1997 | 13.81 | 139 |
| 1996 | 13.49 | 139 |
| 1995 | 13.14 | 138 |
| 1994 | 12.66 | 138 |
| 1993 | 12.19 | 137 |
| 1992 | 11.72 | 137 |
| 1991 | 11.27 | 136 |
| 1990 | 10.82 | 134 |
| 1989 | 10.42 | 133 |
| 1988 | 10.04 | 133 |
| 1987 | 9.69 | 130 |
| 1986 | 9.42 | 129 |