| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 23.1 | 118 |
| 2015 | 24.46 | 135 |
| 2014 | 23.98 | 133 |
| 2013 | 25.95 | 133 |
| 2012 | 25.73 | 133 |
| 2011 | 25.09 | 135 |
| 2010 | 22.12 | 145 |
| 2009 | 19.91 | 147 |
| 2008 | 18.68 | 152 |
| 2007 | 13.84 | 162 |
| 2006 | 11.56 | 162 |
| 2005 | 12.47 | 161 |
| 2004 | 12.27 | 160 |
| 2003 | 11.45 | 159 |
| 2002 | 10.48 | 157 |
| 2001 | 18.49 | 133 |
| 2000 | 17.84 | 132 |
| 1999 | 16.25 | 136 |
| 1998 | 18.27 | 126 |
| 1997 | 13.53 | 142 |
| 1996 | 16.62 | 127 |
| 1995 | 19.42 | 120 |
| 1994 | 25.71 | 99 |
| 1993 | 21.33 | 112 |
| 1992 | 21.44 | 108 |
| 1991 | 19.44 | 110 |
| 1990 | 18.65 | 109 |
| 1989 | 19.64 | 101 |
| 1988 | 22.99 | 89 |
| 1987 | 25.58 | 86 |
| 1986 | 22.19 | 90 |