| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -6.31 | 132 |
| 2015 | 1.48 | 104 |
| 2014 | 7.05 | 34 |
| 2013 | 2.67 | 90 |
| 2012 | 3 | 76 |
| 2011 | 4.33 | 87 |
| 2010 | 4 | 102 |
| 2009 | -.59 | 79 |
| 2008 | 1.74 | 103 |
| 2007 | 3.95 | 107 |
| 2006 | 4.47 | 97 |
| 2005 | 3.01 | 106 |
| 2004 | 1.43 | 137 |
| 2003 | 3.09 | 99 |
| 2002 | 0.86 | 114 |
| 2001 | 3.6 | 66 |
| 2000 | 8.21 | 41 |
| 1999 | 5.99 | 48 |
| 1998 | 2.31 | 96 |
| 1997 | 6.36 | 57 |
| 1996 | 8.3 | 26 |
| 1995 | 3.96 | 69 |
| 1994 | 9.03 | 30 |
| 1993 | 4.76 | 46 |
| 1992 | 16.83 | 8 |
| 1991 | 12.53 | 14 |
| 1990 | 2.79 | 55 |
| 1989 | 5.07 | 50 |
| 1988 | 9.22 | 25 |
| 1987 | 2.25 | 69 |
| 1986 | 11.02 | 17 |