| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2014 | -.18 | 179 |
| 2013 | 0.12 | 172 |
| 2012 | -.41 | 183 |
| 2011 | -2.41 | 183 |
| 2010 | 0.3 | 171 |
| 2009 | 5.17 | 61 |
| 2008 | -.38 | 182 |
| 2007 | 1.49 | 160 |
| 2006 | 0.21 | 177 |
| 2005 | 0.65 | 165 |
| 2004 | 0.76 | 151 |
| 2003 | 3.1 | 73 |
| 2002 | 0.61 | 141 |
| 2001 | 2.05 | 99 |
| 2000 | 2.74 | 95 |
| 1999 | 8.53 | 27 |
| 1998 | 2.89 | 83 |
| 1997 | 0.58 | 135 |
| 1996 | 2.16 | 64 |
| 1995 | 9.8 | 9 |
| 1994 | 1.03 | 87 |
| 1993 | 1.25 | 73 |
| 1992 | 2.38 | 35 |
| 1991 | 3.08 | 26 |
| 1990 | 4.83 | 15 |
| 1989 | 5.74 | 11 |
| 1988 | 4.2 | 16 |
| 1987 | 2.96 | 19 |
| 1986 | 3.43 | 14 |