| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.79 | 62 |
| 2015 | -3.07 | 153 |
| 2014 | 3.39 | 84 |
| 2013 | 1.95 | 109 |
| 2012 | 2.26 | 91 |
| 2011 | 7 | 54 |
| 2010 | 25.22 | 3 |
| 2009 | -.7 | 80 |
| 2008 | -1.1 | 140 |
| 2007 | 7.06 | 66 |
| 2006 | 11.14 | 37 |
| 2005 | 8.25 | 40 |
| 2004 | 10.79 | 35 |
| 2003 | 1.52 | 119 |
| 2002 | 4.71 | 67 |
| 2001 | -8.87 | 155 |
| 2000 | 11.55 | 21 |
| 1999 | 7.05 | 39 |
| 1998 | 0.19 | 121 |
| 1997 | 6.41 | 55 |
| 1996 | 6.34 | 49 |
| 1995 | 9.48 | 29 |
| 1994 | 14.21 | 8 |
| 1993 | 9.22 | 16 |
| 1992 | 4.85 | 50 |
| 1991 | 7.2 | 28 |
| 1990 | 8.88 | 22 |
| 1989 | 7.9 | 27 |
| 1988 | 12.45 | 16 |
| 1987 | 9.38 | 21 |
| 1986 | -1.86 | 93 |