| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.9 | 53 |
| 2015 | 4.64 | 22 |
| 2014 | 2.81 | 42 |
| 2013 | 3.9 | 47 |
| 2012 | 2.9 | 61 |
| 2011 | 5.27 | 34 |
| 2010 | 3.44 | 54 |
| 2009 | 1.17 | 52 |
| 2008 | 2.82 | 68 |
| 2007 | 6.14 | 44 |
| 2006 | 5.62 | 44 |
| 2005 | 5.15 | 52 |
| 2004 | 4.25 | 61 |
| 2003 | 2.24 | 75 |
| 2002 | -.79 | 111 |
| 2001 | 2.17 | 59 |
| 2000 | 2.94 | 55 |
| 1999 | 1.91 | 68 |
| 1998 | -.4 | 104 |
| 1997 | -1.06 | 107 |
| 1996 | -2.21 | 112 |
| 1995 | 1.54 | 64 |
| 1994 | 1.44 | 59 |
| 1993 | 1.16 | 58 |
| 1992 | 1.61 | 50 |
| 1991 | -2.64 | 81 |
| 1990 | 5.01 | 18 |
| 1989 | -1.65 | 70 |
| 1988 | 1.17 | 57 |
| 1987 | 0.02 | 59 |
| 1986 | 0.13 | 60 |