| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.1 | 144 |
| 2015 | 4.51 | 50 |
| 2014 | 2.55 | 117 |
| 2013 | 4.54 | 71 |
| 2012 | 3.01 | 105 |
| 2011 | 5.25 | 70 |
| 2010 | 3.82 | 103 |
| 2009 | 4.24 | 39 |
| 2008 | 5.92 | 67 |
| 2007 | 3.53 | 141 |
| 2006 | 7.57 | 54 |
| 2005 | 3.29 | 139 |
| 2004 | 4.8 | 109 |
| 2003 | 5.96 | 62 |
| 2002 | 3.12 | 102 |
| 2001 | 7.32 | 20 |
| 2000 | 1.91 | 153 |
| 1999 | 1.08 | 143 |
| 1998 | 7.24 | 28 |
| 1997 | -1.56 | 179 |
| 1996 | 12.37 | 6 |
| 1995 | -5.41 | 175 |
| 1994 | 10.59 | 8 |
| 1993 | -.74 | 139 |
| 1992 | -2.1 | 139 |
| 1991 | 7.22 | 27 |
| 1990 | 3.41 | 83 |
| 1989 | 2.85 | 102 |
| 1988 | 11.88 | 13 |
| 1987 | -.33 | 137 |
| 1986 | 9.27 | 17 |