| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 8.04 | 6 |
| 2015 | 6.46 | 9 |
| 2014 | 5.09 | 13 |
| 2013 | 1.11 | 92 |
| 2012 | 1.69 | 83 |
| 2011 | 1.28 | 102 |
| 2010 | 1.55 | 95 |
| 2009 | -9.38 | 147 |
| 2008 | 8.92 | 16 |
| 2007 | 15.82 | 7 |
| 2006 | 13.41 | 12 |
| 2005 | 10.79 | 16 |
| 2004 | 16.44 | 3 |
| 2003 | 9.07 | 17 |
| 2002 | 8.12 | 22 |
| 2001 | 10.93 | 7 |
| 2000 | 1.57 | 81 |
| 1999 | -4.17 | 116 |
| 1998 | 6.22 | 22 |
| 1997 | -4.17 | 115 |
| 1996 | 8.38 | 19 |
| 1995 | 11.02 | 12 |
| 1994 | 3.94 | 35 |
| 1993 | 1.38 | 52 |
| 1992 | -4.73 | 88 |
| 1991 | -11.02 | 101 |