| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.01 | 63 |
| 2015 | 6.16 | 33 |
| 2014 | -.55 | 140 |
| 2013 | 2.62 | 95 |
| 2012 | 1.25 | 110 |
| 2011 | 1.84 | 123 |
| 2010 | -2.57 | 127 |
| 2009 | 6.72 | 34 |
| 2008 | 0.86 | 122 |
| 2007 | 1.61 | 109 |
| 2006 | 1.7 | 103 |
| 2005 | -4.16 | 139 |
| 2004 | 4.11 | 79 |
| 2003 | 3.2 | 72 |
| 2002 | 2.97 | 75 |
| 2001 | 7.28 | 38 |
| 2000 | 2.68 | 77 |
| 1999 | 8.21 | 31 |
| 1998 | 2.85 | 73 |
| 1997 | 12.26 | 9 |
| 1996 | 15.19 | 16 |
| 1995 | -2.01 | 108 |
| 1994 | -8.61 | 115 |
| 1993 | -8.63 | 121 |
| 1992 | -2.64 | 94 |
| 1991 | -7.74 | 111 |
| 1990 | 1.37 | 69 |
| 1989 | 4.62 | 40 |
| 1988 | 10.2 | 21 |