| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 28.47 | 67 |
| 2014 | 30.07 | 61 |
| 2013 | 29.87 | 64 |
| 2012 | 30.24 | 64 |
| 2011 | 29.58 | 67 |
| 2010 | 29.92 | 65 |
| 2009 | 29.9 | 60 |
| 2008 | 28.97 | 78 |
| 2007 | 29.81 | 77 |
| 2006 | 33.23 | 58 |
| 2005 | 32.01 | 58 |
| 2004 | 30.58 | 63 |
| 2003 | 30.66 | 61 |
| 2002 | 32.02 | 57 |
| 2001 | 32.61 | 51 |
| 2000 | 36.02 | 36 |
| 1999 | 32.03 | 50 |
| 1998 | 29.02 | 69 |
| 1997 | 30.75 | 62 |
| 1996 | 29.82 | 73 |
| 1995 | 31.24 | 69 |
| 1994 | 32.31 | 51 |
| 1993 | 32.23 | 54 |
| 1992 | 25.76 | 83 |
| 1991 | 29.52 | 71 |
| 1990 | 29.45 | 66 |
| 1989 | 29.65 | 56 |
| 1988 | 29.17 | 56 |
| 1987 | 30.06 | 53 |
| 1986 | 33.59 | 36 |