| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.02 | 32 |
| 2015 | 4.88 | 39 |
| 2014 | 5.01 | 51 |
| 2013 | 5.56 | 47 |
| 2012 | 6.03 | 41 |
| 2011 | 6.17 | 53 |
| 2010 | 6.22 | 64 |
| 2009 | 4.63 | 37 |
| 2008 | 6.01 | 65 |
| 2007 | 6.35 | 86 |
| 2006 | 5.5 | 99 |
| 2005 | 5.69 | 83 |
| 2004 | 5.03 | 100 |
| 2003 | 4.78 | 80 |
| 2002 | 4.5 | 66 |
| 2001 | 3.64 | 84 |
| 2000 | 4.92 | 80 |
| 1999 | 0.79 | 147 |
| 1998 | -13.13 | 193 |
| 1997 | 4.7 | 90 |
| 1996 | 7.82 | 26 |
| 1995 | 8.22 | 20 |
| 1994 | 7.54 | 26 |
| 1993 | 6.5 | 33 |
| 1992 | 6.5 | 40 |
| 1991 | 6.91 | 29 |
| 1990 | 7.24 | 25 |
| 1989 | 7.46 | 23 |
| 1988 | 5.78 | 62 |
| 1987 | 4.93 | 58 |
| 1986 | 5.88 | 39 |