| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 25.38 | 81 |
| 2015 | 24.66 | 95 |
| 2014 | 23.97 | 101 |
| 2013 | 24.02 | 103 |
| 2012 | 24.5 | 102 |
| 2011 | 23.8 | 111 |
| 2010 | 22.24 | 118 |
| 2009 | 21.9 | 117 |
| 2008 | 21.87 | 124 |
| 2007 | 24.31 | 109 |
| 2006 | 24.86 | 106 |
| 2005 | 26.85 | 92 |
| 2004 | 26.42 | 95 |
| 2003 | 25.65 | 101 |
| 2002 | 24.36 | 106 |
| 2001 | 21.97 | 125 |
| 2000 | 22.36 | 122 |
| 1999 | 22.53 | 120 |
| 1998 | 22.89 | 115 |
| 1997 | 23.62 | 110 |
| 1996 | 23.73 | 110 |
| 1995 | 15.78 | 141 |
| 1994 | 10.29 | 139 |
| 1993 | 21.99 | 99 |
| 1992 | 23.92 | 90 |
| 1991 | 37.08 | 32 |
| 1990 | 33.1 | 49 |
| 1989 | 39.1 | 24 |
| 1988 | 37.5 | 26 |
| 1987 | 37.88 | 25 |
| 1986 | 36.72 | 25 |