| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.68 | 114 |
| 2015 | -.87 | 138 |
| 2014 | 4.13 | 73 |
| 2013 | 4.37 | 66 |
| 2012 | 6.53 | 40 |
| 2011 | 8.96 | 39 |
| 2010 | 3.1 | 113 |
| 2009 | -.17 | 74 |
| 2008 | 6.66 | 45 |
| 2007 | -.83 | 141 |
| 2006 | 4.61 | 93 |
| 2005 | 4.43 | 82 |
| 2004 | 15.21 | 16 |
| 2003 | 2.73 | 101 |
| 2002 | 4.55 | 70 |
| 2001 | 6.16 | 39 |
| 2000 | 10.96 | 26 |
| 1999 | -6.36 | 149 |
| 1998 | 0.46 | 118 |
| 1997 | 1.75 | 104 |
| 1996 | -1.62 | 131 |
| 1995 | -.35 | 109 |
| 1994 | 7.2 | 41 |
| 1993 | 3.81 | 50 |
| 1992 | 1.97 | 63 |
| 1991 | 2.3 | 62 |
| 1990 | 2.22 | 62 |
| 1989 | -.36 | 91 |
| 1988 | 13.03 | 15 |
| 1987 | -7.66 | 98 |
| 1986 | 3.83 | 58 |