| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 22.5 | 154 |
| 2015 | 22.8 | 154 |
| 2014 | 23.11 | 152 |
| 2013 | 23.44 | 152 |
| 2012 | 23.78 | 154 |
| 2011 | 24.13 | 155 |
| 2010 | 24.49 | 155 |
| 2009 | 24.87 | 155 |
| 2008 | 25.25 | 155 |
| 2007 | 25.66 | 155 |
| 2006 | 26.07 | 155 |
| 2005 | 26.5 | 153 |
| 2004 | 26.94 | 150 |
| 2003 | 27.39 | 149 |
| 2002 | 27.86 | 149 |
| 2001 | 28.35 | 150 |
| 2000 | 28.84 | 149 |
| 1999 | 29.33 | 149 |
| 1998 | 29.83 | 148 |
| 1997 | 30.33 | 147 |
| 1996 | 30.84 | 147 |
| 1995 | 31.36 | 145 |
| 1994 | 31.87 | 145 |
| 1993 | 32.4 | 144 |
| 1992 | 32.92 | 143 |
| 1991 | 33.47 | 139 |
| 1990 | 34.17 | 137 |
| 1989 | 34.87 | 135 |
| 1988 | 35.58 | 135 |
| 1987 | 36.3 | 135 |
| 1986 | 37.02 | 136 |