| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.55 | 91 |
| 2015 | 0.74 | 106 |
| 2014 | -.45 | 122 |
| 2013 | -1.98 | 137 |
| 2012 | -3.28 | 146 |
| 2011 | -3.82 | 147 |
| 2010 | -1.31 | 133 |
| 2009 | 2.62 | 101 |
| 2008 | 0.42 | 130 |
| 2007 | 0.64 | 126 |
| 2006 | -.23 | 128 |
| 2005 | 2.69 | 87 |
| 2004 | 2.92 | 78 |
| 2003 | 1.58 | 93 |
| 2002 | 2.62 | 88 |
| 2001 | 3.58 | 72 |
| 2000 | 4.41 | 46 |
| 1999 | 3.41 | 59 |
| 1998 | 6.67 | 29 |
| 1997 | 2.58 | 71 |
| 1996 | 2.9 | 58 |
| 1995 | 0.99 | 73 |
| 1994 | 4.32 | 29 |
| 1993 | -.23 | 85 |
| 1992 | -.94 | 83 |
| 1991 | 9.62 | 17 |
| 1990 | 4.17 | 36 |
| 1989 | 6.44 | 25 |
| 1988 | 8.6 | 11 |
| 1987 | 3.82 | 39 |
| 1986 | 7.16 | 22 |