| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 26.18 | 115 |
| 2015 | 27.84 | 128 |
| 2014 | 29.08 | 128 |
| 2013 | 28.48 | 130 |
| 2012 | 18.14 | 149 |
| 2011 | 19.08 | 150 |
| 2010 | 17.8 | 154 |
| 2009 | 16.11 | 155 |
| 2008 | 15.18 | 160 |
| 2007 | 14 | 161 |
| 2006 | 15.92 | 158 |
| 2005 | 17.9 | 144 |
| 2004 | 16.06 | 148 |
| 2003 | 14.39 | 149 |
| 2002 | 14.93 | 146 |
| 2001 | 15.91 | 142 |
| 2000 | 17.03 | 138 |
| 1999 | 17.6 | 127 |
| 1998 | 17.09 | 129 |
| 1997 | 21.25 | 118 |
| 1996 | 24.45 | 100 |
| 1995 | 21.59 | 106 |
| 1994 | 24.4 | 104 |
| 1993 | 17.83 | 126 |
| 1992 | 15.32 | 125 |
| 1991 | 15.24 | 121 |
| 1990 | 15.77 | 117 |
| 1989 | 16.29 | 114 |
| 1988 | 15.14 | 114 |
| 1987 | 16.86 | 110 |
| 1986 | 15.11 | 111 |