| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 11.44 | 43 |
| 2015 | 8.28 | 79 |
| 2014 | 12.85 | 51 |
| 2013 | 8.38 | 94 |
| 2012 | 9.9 | 86 |
| 2011 | 11.21 | 80 |
| 2010 | 10.09 | 99 |
| 2009 | 11.72 | 76 |
| 2008 | 12.3 | 98 |
| 2007 | 9.91 | 138 |
| 2006 | 16.1 | 95 |
| 2005 | 11.2 | 103 |
| 2004 | 5.76 | 136 |
| 2003 | 9.25 | 103 |
| 2002 | 8.08 | 105 |
| 2001 | 62.53 | 15 |
| 2000 | -4.49 | 155 |
| 1999 | 18.75 | 53 |
| 1998 | 17.45 | 42 |
| 1997 | 56.85 | 11 |
| 1996 | 27.01 | 38 |
| 1995 | 31.86 | 35 |
| 1994 | 20.11 | 73 |
| 1993 | 16.9 | 72 |
| 1992 | 23.57 | 47 |
| 1991 | 49.21 | 16 |
| 1990 | 83.79 | 9 |
| 1989 | 95.9 | 7 |
| 1988 | -13.01 | 123 |
| 1987 | 141.51 | 7 |
| 1986 | 71.02 | 10 |