| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 122.75 | 13 |
| 2014 | 133.5 | 12 |
| 2013 | 87.8 | 48 |
| 2012 | 84.37 | 56 |
| 2011 | 91.32 | 45 |
| 2010 | 72.08 | 65 |
| 2009 | 60.58 | 80 |
| 2008 | 124.21 | 16 |
| 2007 | 94.66 | 43 |
| 2006 | 103.39 | 34 |
| 2005 | 80.22 | 59 |
| 2004 | 92.82 | 41 |
| 2003 | 66.97 | 68 |
| 2002 | 65.25 | 74 |
| 2001 | 68.45 | 65 |
| 2000 | 188.45 | 5 |
| 1999 | 223.86 | 2 |
| 1998 | 248.89 | 1 |
| 1997 | 351.47 | 1 |
| 1996 | 743.41 | 1 |
| 1995 | 986.65 | 1 |
| 1994 | 573.37 | 1 |
| 1993 | 529.93 | 1 |
| 1992 | 431.77 | 1 |
| 1991 | 210.06 | 3 |
| 1990 | 374.09 | 1 |
| 1989 | 137.99 | 7 |
| 1988 | 64.34 | 39 |
| 1987 | 70.93 | 32 |
| 1986 | 79.79 | 24 |