| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.61 | 9 |
| 2015 | 2.74 | 9 |
| 2014 | 2.87 | 10 |
| 2013 | 3.03 | 9 |
| 2012 | 3.26 | 7 |
| 2011 | 3.52 | 8 |
| 2010 | 3.83 | 6 |
| 2009 | 4.13 | 6 |
| 2008 | 4.32 | 6 |
| 2007 | 4.33 | 6 |
| 2006 | 4.17 | 5 |
| 2005 | 3.88 | 5 |
| 2004 | 3.58 | 8 |
| 2003 | 3.43 | 11 |
| 2002 | 3.54 | 8 |
| 2001 | 3.85 | 5 |
| 2000 | 4.35 | 5 |
| 1999 | 4.74 | 4 |
| 1998 | 4.65 | 4 |
| 1997 | 3.76 | 6 |
| 1996 | 2.23 | 39 |
| 1995 | 0.36 | 119 |
| 1994 | -1.23 | 178 |
| 1993 | -2.81 | 196 |
| 1992 | -2.85 | 198 |
| 1991 | -2.02 | 189 |
| 1990 | -1.03 | 175 |
| 1989 | -.19 | 148 |
| 1988 | 0.54 | 116 |
| 1987 | 1.06 | 100 |
| 1986 | 1.4 | 82 |