| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 7.58 | 14 |
| 2015 | 8.69 | 21 |
| 2014 | 8.59 | 20 |
| 2013 | 7.23 | 43 |
| 2012 | -5.07 | 157 |
| 2011 | 20.82 | 6 |
| 2010 | 8.26 | 49 |
| 2009 | 5.87 | 28 |
| 2008 | 5.06 | 67 |
| 2007 | -10.45 | 170 |
| 2006 | 6.95 | 64 |
| 2005 | 8.21 | 41 |
| 2004 | 2.73 | 124 |
| 2003 | 11.49 | 28 |
| 2002 | 2.99 | 91 |
| 2001 | -2.35 | 136 |
| 2000 | 8 | 44 |
| 1999 | 3.32 | 80 |
| 1998 | 2.57 | 94 |
| 1997 | 15.79 | 15 |
| 1996 | 3.84 | 77 |
| 1995 | -7.3 | 125 |
| 1994 | -8.5 | 121 |
| 1993 | -12.84 | 120 |
| 1992 | -13.51 | 116 |
| 1991 | -15.26 | 119 |