| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2008 | 0.64 | 140 |
| 2007 | 2.24 | 140 |
| 2006 | 2.54 | 133 |
| 2005 | 1.01 | 155 |
| 2004 | 3.26 | 105 |
| 2003 | 2.55 | 99 |
| 2002 | -1.03 | 158 |
| 2001 | 4.3 | 38 |
| 2000 | 0.98 | 143 |
| 1999 | 7.88 | 15 |
| 1998 | 6.35 | 22 |
| 1997 | 1.25 | 132 |
| 1996 | 3.53 | 73 |
| 1995 | 7.77 | 14 |
| 1994 | 5.41 | 28 |
| 1993 | 7.06 | 15 |
| 1992 | -.7 | 109 |
| 1991 | 0.1 | 95 |
| 1990 | 0.77 | 93 |
| 1989 | 2.2 | 73 |
| 1988 | 3.06 | 79 |
| 1987 | 2.08 | 72 |
| 1986 | 1.73 | 86 |