| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2009 | -1.16 | 116 |
| 2008 | 1.8 | 141 |
| 2007 | 3.33 | 150 |
| 2006 | 8.64 | 34 |
| 2005 | 4.83 | 97 |
| 2004 | 3.04 | 153 |
| 2003 | -1.94 | 189 |
| 2002 | -.99 | 181 |
| 2001 | -.73 | 172 |
| 2000 | 3.22 | 132 |
| 1999 | 10.41 | 12 |
| 1998 | 7.76 | 20 |
| 1997 | 7.23 | 36 |
| 1996 | 6.91 | 43 |
| 1995 | 5.88 | 57 |
| 1994 | 6.87 | 34 |
| 1993 | 4.33 | 62 |
| 1992 | 3.61 | 68 |
| 1991 | 1.8 | 95 |
| 1990 | 2.25 | 98 |
| 1989 | 4.49 | 61 |
| 1988 | 5.63 | 64 |
| 1987 | 9.23 | 22 |
| 1986 | 4 | 73 |