| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.24 | 48 |
| 2015 | 4.97 | 37 |
| 2014 | 6.01 | 32 |
| 2013 | 4.69 | 68 |
| 2012 | 5.47 | 48 |
| 2011 | 5.29 | 69 |
| 2010 | 6.98 | 47 |
| 2009 | -2.53 | 136 |
| 2008 | 3.32 | 110 |
| 2007 | 9.43 | 31 |
| 2006 | 5.58 | 95 |
| 2005 | 5.33 | 90 |
| 2004 | 6.78 | 59 |
| 2003 | 5.79 | 65 |
| 2002 | 5.39 | 47 |
| 2001 | 0.52 | 164 |
| 2000 | 8.86 | 20 |
| 1999 | 6.14 | 39 |
| 1998 | -7.36 | 191 |
| 1997 | 7.32 | 35 |
| 1996 | 10 | 16 |
| 1995 | 9.83 | 11 |
| 1994 | 9.21 | 12 |
| 1993 | 9.89 | 10 |
| 1992 | 8.89 | 17 |
| 1991 | 9.55 | 11 |
| 1990 | 9.01 | 16 |
| 1989 | 9.06 | 17 |
| 1988 | 9.94 | 19 |
| 1987 | 5.39 | 54 |
| 1986 | 1.15 | 122 |