| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 1.53 | 132 |
| 2014 | 1.99 | 121 |
| 2013 | 5.71 | 45 |
| 2012 | 3.91 | 76 |
| 2011 | 3.58 | 94 |
| 2010 | 3.17 | 90 |
| 2009 | 2.44 | 110 |
| 2008 | 3.07 | 119 |
| 2007 | 2.79 | 134 |
| 2006 | 2.45 | 129 |
| 2005 | -2.5 | 186 |
| 2004 | 0.75 | 152 |
| 2003 | 2.44 | 94 |
| 2002 | 8.56 | 15 |
| 2001 | 8.67 | 21 |
| 2000 | 8.77 | 20 |
| 1999 | 12.2 | 14 |
| 1998 | 11.17 | 12 |
| 1997 | 9.22 | 13 |
| 1996 | 6.41 | 17 |
| 1995 | 5.85 | 18 |
| 1994 | 2.18 | 49 |
| 1993 | 2.16 | 38 |
| 1992 | 1.65 | 47 |
| 1991 | 0.97 | 69 |
| 1990 | 0.56 | 88 |
| 1989 | -.52 | 132 |
| 1988 | -.22 | 128 |
| 1987 | 1.56 | 33 |
| 1986 | 0.51 | 65 |