| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 1.417 | 114 |
| 2014 | 1.104 | 131 |
| 2013 | 1.25 | 134 |
| 2012 | 1.313 | 136 |
| 2011 | 1.5 | 135 |
| 2010 | 1.583 | 133 |
| 2009 | 1.25 | 149 |
| 2008 | 1.25 | 156 |
| 2007 | 1.313 | 159 |
| 2006 | 1.938 | 149 |
| 2005 | 2 | 137 |
| 2004 | 1.708 | 136 |
| 2003 | 1.208 | 143 |
| 2002 | 1 | 142 |
| 2001 | 1.25 | 145 |
| 2000 | 1.271 | 144 |
| 1999 | 1.604 | 146 |
| 1998 | 3.292 | 134 |
| 1997 | 3.729 | 128 |
| 1996 | 4.5 | 116 |
| 1995 | 3 | 133 |
| 1994 | 5.058 | 94 |
| 1993 | 5 | 97 |
| 1992 | 4.69 | 98 |
| 1991 | 7 | 81 |
| 1990 | 7 | 79 |
| 1989 | 6.583 | 79 |
| 1988 | 6.938 | 67 |
| 1987 | 5.479 | 85 |
| 1986 | 6.806 | 69 |