| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.48 | 93 |
| 2015 | 1.5 | 103 |
| 2014 | 1.99 | 90 |
| 2013 | 2.63 | 76 |
| 2012 | 0.52 | 134 |
| 2011 | 4.11 | 63 |
| 2010 | 5.99 | 30 |
| 2009 | -2.67 | 119 |
| 2008 | 1.52 | 115 |
| 2007 | 5.55 | 67 |
| 2006 | 6.35 | 51 |
| 2005 | 6.92 | 34 |
| 2004 | 7.86 | 29 |
| 2003 | 3.26 | 81 |
| 2002 | 1.21 | 114 |
| 2001 | -.18 | 150 |
| 2000 | 6.72 | 25 |
| 1999 | 1.53 | 107 |
| 1998 | -6.67 | 189 |
| 1997 | 4.23 | 63 |
| 1996 | -.27 | 160 |
| 1995 | 0.37 | 137 |
| 1994 | 3.67 | 55 |
| 1993 | 4.39 | 35 |
| 1992 | 5.35 | 31 |
| 1991 | 4.83 | 25 |
| 1990 | 3.5 | 51 |
| 1989 | 1.22 | 93 |
| 1988 | 7.6 | 23 |
| 1987 | 12.26 | 3 |
| 1986 | 9.68 | 8 |