| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -1.54 | 164 |
| 2015 | 2.65 | 104 |
| 2014 | 6.31 | 27 |
| 2013 | 5.39 | 51 |
| 2012 | 4.28 | 77 |
| 2011 | 4.89 | 77 |
| 2010 | 7.84 | 33 |
| 2009 | 6.93 | 17 |
| 2008 | 6.27 | 56 |
| 2007 | 6.83 | 74 |
| 2006 | 8.21 | 42 |
| 2005 | 3.44 | 135 |
| 2004 | 33.74 | 3 |
| 2003 | 10.35 | 17 |
| 2002 | 3.78 | 88 |
| 2001 | 4.41 | 62 |
| 2000 | 5.32 | 72 |
| 1999 | 0.47 | 150 |
| 1998 | 2.72 | 132 |
| 1997 | 2.8 | 133 |
| 1996 | 4.99 | 76 |
| 1995 | -.31 | 163 |
| 1994 | 0.91 | 141 |
| 1993 | 2.09 | 99 |
| 1992 | 0.43 | 119 |
| 1991 | -.62 | 131 |
| 1990 | 12.77 | 8 |
| 1989 | 6.47 | 35 |
| 1988 | 7.54 | 40 |
| 1987 | -10.75 | 159 |
| 1986 | -8.75 | 156 |