| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.87 | 50 |
| 2015 | 2.99 | 79 |
| 2014 | 4.23 | 70 |
| 2013 | 4.34 | 67 |
| 2012 | 5.31 | 44 |
| 2011 | 6.35 | 60 |
| 2010 | 4.92 | 87 |
| 2009 | 3.59 | 43 |
| 2008 | 3.74 | 82 |
| 2007 | 4.72 | 96 |
| 2006 | 4.49 | 95 |
| 2005 | 4.7 | 78 |
| 2004 | 3.94 | 99 |
| 2003 | 3.76 | 88 |
| 2002 | 4.26 | 75 |
| 2001 | 2.73 | 77 |
| 2000 | 5.89 | 64 |
| 1999 | 1.97 | 102 |
| 1998 | -13.95 | 157 |
| 1997 | 5.17 | 70 |
| 1996 | 10.69 | 20 |
| 1995 | 10.42 | 22 |
| 1994 | 11.17 | 19 |
| 1993 | 7.21 | 28 |
| 1992 | 5.77 | 45 |
| 1991 | 10.27 | 19 |
| 1990 | 9.89 | 17 |
| 1989 | 7.85 | 28 |
| 1988 | 5.24 | 51 |
| 1987 | 5.2 | 45 |
| 1986 | 6.65 | 36 |