| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 109.68 | 1 |
| 2014 | 62.17 | 1 |
| 2013 | 40.64 | 1 |
| 2012 | 21.07 | 8 |
| 2011 | 26.09 | 4 |
| 2010 | 28.19 | 1 |
| 2009 | 27.08 | 2 |
| 2008 | 31.44 | 4 |
| 2007 | 18.7 | 4 |
| 2006 | 13.66 | 8 |
| 2005 | 15.95 | 11 |
| 2004 | 21.75 | 6 |
| 2003 | 31.09 | 6 |
| 2002 | 22.43 | 10 |
| 2001 | 12.53 | 20 |
| 2000 | 16.2 | 19 |
| 1999 | 23.57 | 17 |
| 1998 | 35.78 | 10 |
| 1997 | 50.04 | 7 |
| 1996 | 99.88 | 5 |
| 1995 | 59.92 | 19 |
| 1994 | 60.82 | 21 |
| 1993 | 38.12 | 28 |
| 1992 | 31.42 | 25 |
| 1991 | 34.21 | 23 |
| 1990 | 40.66 | 16 |
| 1989 | 84.46 | 8 |
| 1988 | 29.47 | 23 |
| 1987 | 28.14 | 18 |
| 1986 | 11.54 | 46 |