| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2013 | 5.37 | 107 |
| 2012 | 5.47 | 105 |
| 2011 | 5.43 | 105 |
| 2010 | 5.79 | 106 |
| 2009 | 6.13 | 106 |
| 2008 | 4.44 | 116 |
| 2007 | 4.13 | 119 |
| 2006 | 3.98 | 121 |
| 2005 | 4.02 | 122 |
| 2004 | 4.04 | 127 |
| 2003 | 4.56 | 120 |
| 2002 | 4.1 | 129 |
| 2001 | 4.54 | 125 |
| 2000 | 4.21 | 126 |
| 1999 | 4.73 | 117 |
| 1998 | 5.42 | 116 |
| 1997 | 4.93 | 120 |
| 1996 | 4.49 | 125 |
| 1995 | 5.53 | 121 |
| 1994 | 5.26 | 109 |
| 1993 | 5.49 | 108 |
| 1992 | 5.43 | 106 |
| 1991 | 5.58 | 103 |
| 1990 | 5.47 | 104 |
| 1989 | 6.3 | 92 |
| 1988 | 6.76 | 89 |
| 1987 | 6.58 | 91 |
| 1986 | 6.67 | 87 |