| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.53 | 11 |
| 2015 | 5.86 | 11 |
| 2014 | 6.27 | 9 |
| 2013 | 6.7 | 14 |
| 2012 | 6.65 | 18 |
| 2011 | 6.55 | 25 |
| 2010 | 6.89 | 26 |
| 2009 | 5.76 | 12 |
| 2008 | 6 | 31 |
| 2007 | 5.78 | 62 |
| 2006 | 6.85 | 42 |
| 2005 | 5.44 | 51 |
| 2004 | 4.76 | 70 |
| 2003 | 4.5 | 58 |
| 2002 | 4.33 | 43 |
| 2001 | 4.09 | 40 |
| 2000 | 4.05 | 65 |
| 1999 | 5.45 | 27 |
| 1998 | 2.07 | 106 |
| 1997 | 4.77 | 48 |
| 1996 | 4.66 | 51 |
| 1995 | 4.57 | 42 |
| 1994 | 5.49 | 26 |
| 1993 | 3.14 | 49 |
| 1992 | 2.69 | 56 |
| 1991 | 1.4 | 70 |
| 1990 | 3.7 | 44 |
| 1989 | 10.93 | 2 |
| 1988 | -4.82 | 153 |
| 1987 | -4.23 | 143 |
| 1986 | 1.95 | 81 |