| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.95 | 30 |
| 2015 | 3.01 | 6 |
| 2014 | 4.04 | 3 |
| 2013 | 4.86 | 2 |
| 2012 | 5.34 | 2 |
| 2011 | 5.31 | 1 |
| 2010 | 5.3 | 2 |
| 2009 | 5.18 | 4 |
| 2008 | 4.93 | 4 |
| 2007 | 4.33 | 5 |
| 2006 | 3.49 | 8 |
| 2005 | 2.24 | 31 |
| 2004 | 0.96 | 89 |
| 2003 | 0.36 | 119 |
| 2002 | 0.87 | 89 |
| 2001 | 2.02 | 39 |
| 2000 | 3.93 | 7 |
| 1999 | 5.63 | 3 |
| 1998 | 6.09 | 3 |
| 1997 | 4.27 | 3 |
| 1996 | 0.59 | 109 |
| 1991 | -3.79 | 199 |
| 1990 | -.56 | 162 |
| 1989 | 2.12 | 47 |
| 1988 | 4.15 | 8 |
| 1987 | 4.93 | 6 |
| 1986 | 4.76 | 5 |