| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.88 | 61 |
| 2015 | 3.25 | 84 |
| 2014 | 2.35 | 122 |
| 2013 | 5.85 | 39 |
| 2012 | 6.14 | 40 |
| 2011 | 6.33 | 49 |
| 2010 | 8.33 | 27 |
| 2009 | 1.1 | 90 |
| 2008 | 9.13 | 17 |
| 2007 | 8.52 | 44 |
| 2006 | 7.53 | 55 |
| 2005 | 6.29 | 68 |
| 2004 | 4.96 | 104 |
| 2003 | 4.17 | 98 |
| 2002 | 5.45 | 45 |
| 2001 | 0.62 | 160 |
| 2000 | 2.69 | 144 |
| 1999 | 1.49 | 139 |
| 1998 | -.39 | 169 |
| 1997 | 6.48 | 44 |
| 1996 | 2.8 | 128 |
| 1995 | 7.41 | 27 |
| 1994 | 12.31 | 6 |
| 1993 | 5.24 | 49 |
| 1992 | -.54 | 133 |
| 1991 | 2.22 | 89 |
| 1990 | -4.98 | 155 |
| 1989 | -12.31 | 163 |
| 1988 | -9.44 | 160 |
| 1987 | 9.73 | 17 |
| 1986 | 9.43 | 15 |