| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.1 | 49 |
| 2015 | 2.37 | 60 |
| 2014 | 1.56 | 81 |
| 2013 | 5.48 | 24 |
| 2012 | 2.95 | 59 |
| 2011 | 3.44 | 56 |
| 2010 | 4.6 | 41 |
| 2009 | 1.76 | 43 |
| 2008 | -4.19 | 144 |
| 2007 | 2.44 | 90 |
| 2006 | 6.95 | 34 |
| 2005 | 3.59 | 67 |
| 2004 | -.34 | 130 |
| 2003 | -.54 | 117 |
| 2002 | -1.87 | 120 |
| 2001 | 1.34 | 80 |
| 2000 | -3.08 | 114 |
| 1999 | 1.27 | 78 |
| 1998 | 1.71 | 85 |
| 1997 | 0.93 | 92 |
| 1996 | -.32 | 103 |
| 1995 | 10.67 | 14 |
| 1994 | -1.22 | 82 |
| 1993 | -4.56 | 92 |
| 1992 | -4.13 | 86 |
| 1991 | -.89 | 71 |
| 1990 | -3.57 | 70 |
| 1989 | 2.37 | 42 |
| 1988 | 4.76 | 28 |
| 1987 | 4.86 | 20 |
| 1986 | 14.77 | 6 |