| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 1.65 | 93 |
| 2014 | 0.54 | 112 |
| 2013 | 1.5 | 97 |
| 2012 | 1.68 | 98 |
| 2011 | 1.93 | 85 |
| 2010 | 1.94 | 85 |
| 2009 | 2.04 | 112 |
| 2008 | -.08 | 137 |
| 2007 | 1.15 | 122 |
| 2006 | 0.07 | 125 |
| 2005 | 0.79 | 115 |
| 2004 | 1.18 | 106 |
| 2003 | 1.85 | 89 |
| 2002 | 2.65 | 85 |
| 2001 | 3.41 | 76 |
| 2000 | 3.88 | 52 |
| 1999 | 3.47 | 57 |
| 1998 | 1.22 | 92 |
| 1997 | 1.45 | 87 |
| 1996 | 2.29 | 73 |
| 1995 | 3.86 | 40 |
| 1994 | 3.54 | 42 |
| 1993 | 3.2 | 49 |
| 1992 | 2.67 | 52 |
| 1991 | 4.06 | 44 |
| 1990 | 3.31 | 40 |
| 1989 | 2.91 | 53 |
| 1988 | 3.94 | 33 |
| 1987 | 3.92 | 38 |
| 1986 | 3.4 | 43 |