| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.91 | 126 |
| 2015 | 19.72 | 18 |
| 2014 | 14.83 | 36 |
| 2013 | 16.03 | 42 |
| 2012 | 13.06 | 58 |
| 2011 | 19.73 | 33 |
| 2010 | 24.59 | 24 |
| 2009 | 17.32 | 47 |
| 2008 | 14.33 | 86 |
| 2007 | 40.58 | 18 |
| 2006 | 40.24 | 17 |
| 2005 | 36.28 | 15 |
| 2004 | 33.74 | 15 |
| 2003 | 38.54 | 16 |
| 2002 | 33.76 | 22 |
| 2001 | 36.31 | 33 |
| 2000 | 57.93 | 10 |
| 1999 | 56.75 | 8 |
| 1998 | 37.64 | 11 |
| 1997 | 28.85 | 32 |
| 1996 | 29.56 | 35 |
| 1995 | 112.58 | 5 |
| 1994 | 216.55 | 7 |