| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 28.92 | 110 |
| 2015 | 28.12 | 127 |
| 2014 | 25.75 | 131 |
| 2013 | 27.13 | 132 |
| 2012 | 27.09 | 130 |
| 2011 | 24.33 | 139 |
| 2010 | 25.31 | 136 |
| 2009 | 25.32 | 136 |
| 2008 | 23.49 | 138 |
| 2007 | 27.86 | 125 |
| 2006 | 28.05 | 120 |
| 2005 | 28.66 | 114 |
| 2004 | 28.33 | 113 |
| 2003 | 30.1 | 108 |
| 2002 | 27.93 | 109 |
| 2001 | 27.14 | 108 |
| 2000 | 31.85 | 91 |
| 1999 | 31.44 | 92 |
| 1998 | 28.65 | 93 |
| 1997 | 26.47 | 96 |
| 1996 | 22.69 | 106 |
| 1995 | 20.14 | 113 |
| 1994 | 20.77 | 118 |
| 1993 | 19.22 | 121 |
| 1992 | 13.69 | 127 |
| 1991 | 10.56 | 130 |
| 1990 | 11.48 | 124 |
| 1989 | 20.1 | 99 |
| 1988 | 25.15 | 86 |
| 1987 | 22.05 | 92 |
| 1986 | 19.58 | 102 |