| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.09 | 24 |
| 2015 | 4.14 | 26 |
| 2014 | 4.2 | 27 |
| 2013 | 4.31 | 28 |
| 2012 | 4.46 | 23 |
| 2011 | 4.65 | 21 |
| 2010 | 4.9 | 17 |
| 2009 | 5.12 | 15 |
| 2008 | 5.26 | 15 |
| 2007 | 5.25 | 13 |
| 2006 | 5.11 | 14 |
| 2005 | 4.81 | 22 |
| 2004 | 4.52 | 24 |
| 2003 | 4.36 | 29 |
| 2002 | 4.47 | 25 |
| 2001 | 4.78 | 19 |
| 2000 | 5.28 | 11 |
| 1999 | 5.67 | 9 |
| 1998 | 5.58 | 10 |
| 1997 | 4.69 | 20 |
| 1996 | 3.16 | 70 |
| 1995 | 1.29 | 136 |
| 1994 | -.3 | 194 |
| 1993 | 2.71 | 89 |
| 1992 | 3.92 | 55 |
| 1991 | 4.74 | 35 |
| 1990 | 5.73 | 18 |
| 1989 | 6.55 | 11 |
| 1988 | 7.31 | 9 |
| 1987 | 7.82 | 6 |
| 1986 | 8.17 | 3 |