| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.34 | 51 |
| 2015 | 2.88 | 76 |
| 2014 | 1.54 | 116 |
| 2013 | 4.7 | 57 |
| 2012 | -1.09 | 134 |
| 2011 | 14.18 | 9 |
| 2010 | -11.98 | 167 |
| 2009 | 1.68 | 96 |
| 2008 | 5.73 | 61 |
| 2007 | 0.92 | 117 |
| 2006 | 2.5 | 94 |
| 2005 | -.15 | 117 |
| 2004 | 1.04 | 120 |
| 2003 | -1.79 | 129 |
| 2002 | 2.91 | 76 |
| 2001 | 11.4 | 17 |
| 2000 | 12.7 | 10 |
| 1999 | 17.1 | 6 |
| 1998 | -18.8 | 159 |
| 1997 | 2.5 | 73 |
| 1996 | -5.3 | 144 |
| 1995 | -8 | 125 |
| 1994 | -12 | 123 |
| 1993 | -4 | 99 |
| 1992 | -9 | 114 |
| 1991 | -3.7 | 102 |