| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2014 | 6.25 | 10 |
| 2013 | 3.29 | 58 |
| 2012 | 5.74 | 23 |
| 2011 | 8.22 | 16 |
| 2010 | 5.24 | 41 |
| 2009 | 3.69 | 23 |
| 2008 | 4.11 | 65 |
| 2007 | 4.6 | 92 |
| 2006 | -.16 | 182 |
| 2005 | 3.76 | 81 |
| 2004 | 0.21 | 176 |
| 2003 | -.36 | 169 |
| 2002 | -2.65 | 178 |
| 2001 | -2.64 | 174 |
| 2000 | -4.98 | 192 |
| 1999 | -.76 | 151 |
| 1998 | -6.25 | 185 |
| 1997 | -6.37 | 186 |
| 1996 | 4.98 | 46 |
| 1995 | -5.76 | 170 |
| 1994 | 3.29 | 63 |
| 1993 | 15.26 | 2 |
| 1992 | 11.02 | 6 |
| 1991 | 6.82 | 14 |
| 1990 | -5.43 | 152 |
| 1989 | -3.88 | 145 |
| 1988 | 0.32 | 115 |
| 1987 | 0.15 | 103 |
| 1986 | 1.98 | 80 |