| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 3.19 | 44 |
| 2014 | 2.93 | 40 |
| 2013 | 2.71 | 57 |
| 2012 | 2.63 | 66 |
| 2011 | 2.51 | 71 |
| 2010 | 1.73 | 91 |
| 2009 | 0.3 | 67 |
| 2008 | 0.4 | 104 |
| 2007 | 1.82 | 104 |
| 2006 | 0.97 | 114 |
| 2005 | 0.4 | 125 |
| 2004 | 0.48 | 124 |
| 2003 | 3.24 | 61 |
| 2002 | 1.59 | 82 |
| 2001 | 0.98 | 85 |
| 2000 | 1.36 | 83 |
| 1999 | 1.69 | 72 |
| 1998 | 1.8 | 83 |
| 1997 | 3.7 | 46 |
| 1996 | 2.47 | 71 |
| 1995 | -1.09 | 96 |
| 1994 | -1.86 | 85 |
| 1993 | 12.89 | 5 |
| 1992 | -12.39 | 104 |
| 1991 | -5.21 | 91 |
| 1990 | -4.99 | 74 |
| 1989 | -15.93 | 88 |
| 1988 | -14.48 | 85 |
| 1987 | 1.37 | 48 |
| 1986 | 20.28 | 4 |