| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9.98 | 60 |
| 2015 | 19.64 | 19 |
| 2014 | 12.31 | 55 |
| 2013 | 14.02 | 54 |
| 2012 | -5.39 | 155 |
| 2011 | 18.24 | 38 |
| 2010 | 85.26 | 1 |
| 2009 | 18.64 | 39 |
| 2008 | 38.42 | 9 |
| 2007 | -12.29 | 164 |
| 2006 | 94.38 | 2 |
| 2005 | 33.35 | 22 |
| 2004 | 36.46 | 14 |
| 2003 | 33.17 | 19 |
| 2002 | 19.68 | 48 |
| 2001 | 12.85 | 87 |
| 1998 | 6.64 | 105 |
| 1997 | 18.2 | 71 |
| 1996 | 3.57 | 141 |
| 1995 | 11.26 | 91 |
| 1994 | -3.45 | 143 |
| 1993 | 22.79 | 55 |
| 1992 | 23.28 | 48 |