| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 16.35 | 3 |
| 2015 | 16.25 | 4 |
| 2014 | 16.05 | 4 |
| 2013 | 15.78 | 3 |
| 2012 | 15.6 | 3 |
| 2011 | 15.52 | 1 |
| 2010 | 15.24 | 1 |
| 2009 | 16.1 | 1 |
| 2008 | 17.49 | 3 |
| 2007 | 19.72 | 6 |
| 2006 | 23.18 | 23 |
| 2005 | 28.18 | 42 |
| 2004 | 29.02 | 44 |
| 2003 | 30.05 | 44 |
| 2002 | 31.4 | 47 |
| 2001 | 33.18 | 52 |
| 2000 | 35.45 | 54 |
| 1999 | 35.8 | 53 |
| 1998 | 36.37 | 52 |
| 1997 | 37.09 | 53 |
| 1996 | 37.79 | 54 |
| 1995 | 38.28 | 54 |
| 1994 | 38.63 | 52 |
| 1993 | 38.87 | 52 |
| 1992 | 39.09 | 53 |
| 1991 | 39.51 | 53 |
| 1990 | 40.21 | 53 |
| 1989 | 40.79 | 52 |
| 1988 | 41.37 | 51 |
| 1987 | 41.87 | 51 |
| 1986 | 42 | 51 |