| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.7 | 37 |
| 2015 | 4.85 | 41 |
| 2014 | 4.79 | 55 |
| 2013 | 4.93 | 60 |
| 2012 | 6.5 | 35 |
| 2011 | 6.32 | 50 |
| 2010 | 4.41 | 92 |
| 2009 | -3.29 | 146 |
| 2008 | 3.44 | 106 |
| 2007 | 5.08 | 116 |
| 2006 | 3.8 | 148 |
| 2005 | 4.28 | 111 |
| 2004 | 5.31 | 90 |
| 2003 | 2.52 | 137 |
| 2002 | 0.75 | 152 |
| 2001 | 2.96 | 100 |
| 2000 | 4.1 | 104 |
| 1999 | 7.04 | 31 |
| 1998 | 3.71 | 103 |
| 1997 | 3.97 | 107 |
| 1996 | 6.34 | 50 |
| 1995 | 5.91 | 56 |
| 1994 | 3.34 | 99 |
| 1993 | -.39 | 135 |
| 1992 | 0.39 | 120 |
| 1991 | -.19 | 124 |
| 1990 | -.09 | 124 |
| 1989 | -1.7 | 149 |
| 1988 | -12.45 | 163 |
| 1987 | -.71 | 140 |
| 1986 | -1.02 | 141 |