| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 22.2 | 154 |
| 2015 | 21.7 | 154 |
| 2014 | 21.3 | 154 |
| 2013 | 20.87 | 155 |
| 2012 | 20.41 | 156 |
| 2011 | 19.96 | 156 |
| 2010 | 19.54 | 155 |
| 2009 | 19.33 | 157 |
| 2008 | 19.15 | 157 |
| 2007 | 18.98 | 156 |
| 2006 | 18.77 | 156 |
| 2005 | 18.52 | 155 |
| 2004 | 18.31 | 154 |
| 2003 | 18.1 | 154 |
| 2002 | 17.87 | 154 |
| 2001 | 17.63 | 153 |
| 2000 | 17.38 | 154 |
| 1999 | 17.09 | 154 |
| 1998 | 16.84 | 154 |
| 1997 | 16.63 | 154 |
| 1996 | 16.45 | 154 |
| 1995 | 16.29 | 153 |
| 1994 | 16.08 | 151 |
| 1993 | 15.91 | 151 |
| 1992 | 15.75 | 153 |
| 1991 | 15.59 | 154 |
| 1990 | 15.42 | 155 |
| 1989 | 15.09 | 152 |
| 1988 | 14.77 | 149 |
| 1987 | 14.5 | 148 |
| 1986 | 14.27 | 148 |