| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.31 | 44 |
| 2015 | 3.24 | 50 |
| 2014 | 3.2 | 53 |
| 2013 | 3.25 | 53 |
| 2012 | 3.47 | 49 |
| 2011 | 3.81 | 40 |
| 2010 | 4.28 | 30 |
| 2009 | 4.72 | 21 |
| 2008 | 4.92 | 19 |
| 2007 | 4.72 | 19 |
| 2006 | 4.2 | 31 |
| 2005 | 3.39 | 57 |
| 2004 | 2.67 | 78 |
| 2003 | 2.49 | 80 |
| 2002 | 3.14 | 65 |
| 2001 | 4.4 | 24 |
| 2000 | 6.12 | 6 |
| 1999 | 7.73 | 2 |
| 1998 | 8.64 | 2 |
| 1997 | 8.15 | 2 |
| 1996 | -1.22 | 202 |
| 1995 | -3.4 | 209 |
| 1994 | -5.37 | 209 |
| 1993 | -6.74 | 209 |
| 1992 | -7.12 | 209 |
| 1991 | 2.77 | 97 |
| 1990 | 3.2 | 88 |
| 1989 | 3.52 | 77 |
| 1988 | 4.19 | 67 |
| 1987 | 5.15 | 41 |
| 1986 | 6.34 | 22 |