| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2013 | 0.57 | 134 |
| 2012 | -1.59 | 169 |
| 2011 | -.75 | 169 |
| 2010 | -2.12 | 180 |
| 2009 | -1.83 | 106 |
| 2008 | -1.22 | 170 |
| 2007 | -2.76 | 196 |
| 2006 | -.47 | 186 |
| 2005 | 0.71 | 164 |
| 2004 | 1.74 | 145 |
| 2003 | 1.13 | 138 |
| 2002 | 1.64 | 97 |
| 2001 | 9.61 | 8 |
| 2000 | 1.23 | 140 |
| 1999 | 1.56 | 103 |
| 1998 | 6.13 | 24 |
| 1997 | 2.2 | 106 |
| 1996 | 1.75 | 116 |
| 1995 | 3.12 | 70 |
| 1994 | 3.02 | 67 |
| 1993 | 2.98 | 54 |
| 1992 | 3.39 | 49 |
| 1991 | 0.14 | 93 |
| 1990 | 1.56 | 78 |
| 1989 | 3.39 | 54 |
| 1988 | 4.91 | 43 |
| 1987 | 4.78 | 37 |
| 1986 | 3.98 | 37 |