| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.38 | 20 |
| 2015 | 4.6 | 20 |
| 2014 | 8.28 | 1 |
| 2013 | 8.18 | 9 |
| 2012 | 9.12 | 7 |
| 2011 | 12.77 | 4 |
| 2010 | 7.5 | 16 |
| 2009 | 4.57 | 16 |
| 2008 | 13.17 | 1 |
| 2007 | 9.69 | 20 |
| 2006 | 9.69 | 16 |
| 2005 | 11.82 | 8 |
| 2004 | 3.94 | 90 |
| 2003 | 2.25 | 109 |
| 2002 | -.74 | 155 |
| 2001 | 3.25 | 55 |
| 2000 | 4.3 | 59 |
| 1999 | 15.13 | 2 |
| 1998 | 5.68 | 27 |
| 1997 | -12.78 | 192 |
| 1996 | 4.72 | 48 |
| 1995 | -9.25 | 178 |
| 1994 | -19.4 | 175 |
| 1993 | -1.31 | 123 |
| 1992 | -17.38 | 171 |
| 1991 | -7.25 | 156 |
| 1990 | 31.78 | 2 |
| 1989 | -6.71 | 156 |
| 1988 | 8.27 | 21 |