| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 7.15 | 6 |
| 2014 | 4.33 | 17 |
| 2013 | 4.88 | 32 |
| 2012 | 3 | 55 |
| 2011 | 1.21 | 103 |
| 2010 | 7.72 | 20 |
| 2009 | 0.82 | 56 |
| 2008 | -1.82 | 130 |
| 2007 | 1.45 | 107 |
| 2006 | 18.58 | 7 |
| 2005 | 0.22 | 127 |
| 2004 | 1.34 | 108 |
| 2003 | 5.95 | 35 |
| 2002 | 1.85 | 75 |
| 2001 | 3.49 | 37 |
| 2000 | 1.72 | 78 |
| 1999 | 4.68 | 27 |
| 1998 | 1.42 | 89 |
| 1997 | 1.82 | 75 |
| 1996 | 3.4 | 60 |
| 1995 | 0.95 | 76 |
| 1994 | 5.11 | 21 |
| 1993 | -11.82 | 104 |
| 1992 | -18.38 | 105 |
| 1991 | -10.93 | 99 |
| 1990 | -7.43 | 81 |
| 1989 | 0.54 | 58 |
| 1988 | 1.21 | 56 |
| 1987 | 0.94 | 54 |
| 1986 | 0.12 | 61 |