| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 3.625 | 136 |
| 2014 | 4.692 | 137 |
| 2013 | 5 | 137 |
| 2012 | 6.05 | 113 |
| 2011 | 5.5 | 124 |
| 2010 | 5.5 | 126 |
| 2009 | 5.5 | 130 |
| 2008 | 5.292 | 143 |
| 2007 | 8.161 | 115 |
| 2006 | 8.25 | 106 |
| 2005 | 7.467 | 116 |
| 2004 | 7.608 | 111 |
| 2003 | 5.9 | 132 |
| 2002 | 7.408 | 120 |
| 2001 | 8.813 | 111 |
| 2000 | 9.854 | 112 |
| 1999 | 10.292 | 112 |
| 1998 | 10.958 | 109 |
| 1997 | 10.5 | 107 |
| 1996 | 10.5 | 106 |
| 1995 | 10.5 | 106 |
| 1994 | 16 | 56 |
| 1993 | 16 | 58 |
| 1992 | 16.25 | 54 |
| 1991 | 18 | 43 |
| 1990 | 17.333 | 36 |
| 1989 | 17 | 35 |
| 1988 | 17.042 | 24 |
| 1987 | 15.417 | 28 |
| 1986 | 16 | 24 |