| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 17.38 | 10 |
| 2014 | 38.81 | 2 |
| 2013 | 20.69 | 8 |
| 2012 | 15.73 | 15 |
| 2011 | 15.11 | 15 |
| 2010 | 7.73 | 41 |
| 2009 | 13.28 | 15 |
| 2008 | 17.13 | 15 |
| 2007 | 31.43 | 4 |
| 2006 | 19.24 | 15 |
| 2005 | 13.16 | 18 |
| 2004 | 1.9 | 116 |
| 2003 | 6.28 | 34 |
| 2002 | 6.59 | 29 |
| 2001 | -4.84 | 181 |
| 2000 | -3.04 | 177 |
| 1999 | 22.86 | 5 |
| 1998 | 1.68 | 113 |
| 1997 | 3.41 | 56 |
| 1996 | 2.86 | 45 |
| 1995 | 5.91 | 17 |
| 1994 | 0.17 | 132 |
| 1993 | 14.91 | 4 |
| 1992 | 0.09 | 121 |
| 1991 | 1.2 | 55 |
| 1990 | 0.81 | 76 |
| 1989 | -.3 | 130 |
| 1988 | 0.41 | 80 |
| 1987 | 1.89 | 28 |
| 1986 | 1.21 | 36 |