| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.01 | 78 |
| 2015 | 0.5 | 130 |
| 2014 | 1.2 | 116 |
| 2013 | 2.45 | 82 |
| 2012 | 0.51 | 135 |
| 2011 | 3.14 | 77 |
| 2010 | 3.61 | 80 |
| 2009 | -1.12 | 93 |
| 2008 | 1.24 | 125 |
| 2007 | 4.27 | 95 |
| 2006 | 3.95 | 98 |
| 2005 | 2.57 | 121 |
| 2004 | 3.27 | 104 |
| 2003 | -.63 | 171 |
| 2002 | -2.06 | 172 |
| 2001 | -2.09 | 168 |
| 2000 | 6.1 | 34 |
| 1999 | 1.13 | 120 |
| 1998 | 1.89 | 112 |
| 1997 | 1.51 | 128 |
| 1996 | 3.42 | 77 |
| 1995 | 3.79 | 56 |
| 1994 | 4.2 | 46 |
| 1993 | 2.79 | 59 |
| 1992 | 2.04 | 65 |
| 1991 | 1.41 | 69 |
| 1990 | 3.58 | 49 |
| 1989 | -.83 | 125 |
| 1988 | 0.35 | 114 |
| 1987 | 5.47 | 33 |
| 1986 | 3.18 | 48 |