| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.15 | 121 |
| 2015 | 0.12 | 122 |
| 2014 | 0.09 | 123 |
| 2013 | 0.11 | 122 |
| 2012 | 0.14 | 121 |
| 2011 | 0.71 | 93 |
| 2010 | -.06 | 137 |
| 2009 | -2.54 | 195 |
| 2008 | 1.68 | 55 |
| 2007 | 2.72 | 18 |
| 2006 | 1.71 | 51 |
| 2005 | 0.96 | 85 |
| 2004 | 0.78 | 96 |
| 2003 | 0.58 | 107 |
| 2002 | 0.02 | 134 |
| 2001 | 0.47 | 107 |
| 2000 | 1.33 | 69 |
| 1999 | 2.75 | 21 |
| 1998 | 2.11 | 42 |
| 1997 | 0.26 | 123 |
| 1996 | 2.21 | 41 |
| 1995 | 3.93 | 6 |
| 1994 | 1.32 | 78 |
| 1993 | 3.45 | 9 |
| 1992 | 3.12 | 16 |
| 1991 | 4.13 | 7 |
| 1990 | 0.6 | 114 |
| 1989 | 3.04 | 14 |
| 1988 | 3.17 | 14 |
| 1987 | 3.28 | 14 |
| 1986 | 3.38 | 12 |