| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.444 | 98 |
| 2015 | 1.414 | 116 |
| 2014 | 2.95 | 75 |
| 2013 | 1.739 | 121 |
| 2012 | 1.626 | 130 |
| 2011 | 1.403 | 137 |
| 2010 | 1.047 | 148 |
| 2009 | 3.439 | 97 |
| 2008 | 4.656 | 88 |
| 2007 | 3.546 | 126 |
| 2006 | 4.027 | 101 |
| 2005 | 4.934 | 65 |
| 2004 | 7.42 | 41 |
| 2003 | 11.41 | 22 |
| 2002 | 9.58 | 31 |
| 2001 | 9.819 | 38 |
| 2000 | 10.983 | 36 |
| 1999 | 12.259 | 35 |
| 1998 | 12.819 | 42 |
| 1997 | 14.728 | 35 |
| 1996 | 19.158 | 26 |
| 1995 | 18.87 | 31 |
| 1994 | 18.432 | 28 |
| 1993 | 22.181 | 23 |
| 1992 | 23.223 | 20 |
| 1991 | 23.775 | 21 |
| 1990 | 23.834 | 20 |
| 1989 | 23.667 | 16 |
| 1988 | 27.738 | 11 |
| 1987 | 30.35 | 8 |
| 1986 | 33.39 | 7 |