| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 6.12 | 97 |
| 2014 | -5.64 | 151 |
| 2013 | 19.73 | 22 |
| 2012 | -1.81 | 148 |
| 2011 | 37.09 | 7 |
| 2010 | 22.94 | 30 |
| 2009 | 32.78 | 10 |
| 2008 | 38.27 | 10 |
| 2007 | 34.78 | 31 |
| 2006 | 32.43 | 32 |
| 2005 | 28.92 | 32 |
| 2004 | 57.58 | 4 |
| 2003 | 13.86 | 77 |
| 2002 | -17.46 | 160 |
| 2001 | -4.98 | 151 |
| 2000 | 21.07 | 47 |
| 1999 | 10.54 | 102 |
| 1998 | 150.99 | 2 |
| 1997 | -88.79 | 155 |
| 1996 | 701.79 | 2 |
| 1995 | 20.67 | 59 |
| 1994 | 11.72 | 98 |
| 1993 | 65.64 | 14 |
| 1992 | 19.62 | 57 |
| 1989 | 21.07 | 44 |
| 1988 | 9.74 | 85 |
| 1987 | 14.99 | 68 |
| 1986 | 18.66 | 48 |