| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2013 | -.58 | 176 |
| 2012 | -2.77 | 186 |
| 2011 | -1.89 | 187 |
| 2010 | -2.61 | 189 |
| 2009 | -2.36 | 132 |
| 2008 | -1.8 | 186 |
| 2007 | -3.33 | 200 |
| 2006 | -.89 | 192 |
| 2005 | 0.57 | 192 |
| 2004 | 1.76 | 174 |
| 2003 | 1.19 | 159 |
| 2002 | 1.77 | 133 |
| 2001 | 9.85 | 10 |
| 2000 | 1.51 | 161 |
| 1999 | 2.07 | 129 |
| 1998 | 6.75 | 34 |
| 1997 | 3.16 | 126 |
| 1996 | 2.89 | 124 |
| 1995 | 4.08 | 95 |
| 1994 | 3.98 | 82 |
| 1993 | 3.85 | 74 |
| 1992 | 4.06 | 63 |
| 1991 | 0.85 | 113 |
| 1990 | 2.47 | 97 |
| 1989 | 4.33 | 67 |
| 1988 | 5.89 | 58 |
| 1987 | 5.77 | 48 |
| 1986 | 4.98 | 53 |