| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.213 | 105 |
| 2015 | 2.371 | 85 |
| 2014 | 3.323 | 70 |
| 2013 | 3.878 | 68 |
| 2012 | 4.739 | 64 |
| 2011 | 4.009 | 76 |
| 2010 | 5.323 | 61 |
| 2009 | 6.959 | 57 |
| 2008 | 4.15 | 99 |
| 2007 | 6.351 | 64 |
| 2006 | 9.772 | 21 |
| 2005 | 10.143 | 21 |
| 2004 | 9.514 | 25 |
| 2003 | 10.41 | 26 |
| 2002 | 11.458 | 25 |
| 2001 | 11.772 | 29 |
| 2000 | 13.382 | 26 |
| 1999 | 14.308 | 27 |
| 1998 | 12.757 | 43 |
| 1997 | 13.025 | 42 |
| 1996 | 17.29 | 31 |
| 1995 | 23.877 | 26 |
| 1994 | 17.723 | 30 |
| 1993 | 16.898 | 30 |
| 1992 | 15.803 | 35 |
| 1991 | 27.315 | 18 |
| 1990 | 21.156 | 22 |
| 1989 | 15.618 | 30 |
| 1988 | 15.177 | 22 |
| 1987 | 14.056 | 24 |
| 1986 | 16.673 | 17 |