| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.53 | 59 |
| 2015 | 1.15 | 91 |
| 2014 | 1.79 | 74 |
| 2013 | 3.66 | 49 |
| 2012 | 5.09 | 31 |
| 2011 | 7.19 | 23 |
| 2010 | 9.63 | 8 |
| 2009 | -1.85 | 103 |
| 2008 | 3.09 | 66 |
| 2007 | 5.96 | 48 |
| 2006 | 6.32 | 36 |
| 2005 | 6.55 | 43 |
| 2004 | 7.1 | 35 |
| 2003 | 3.36 | 58 |
| 2002 | 0.97 | 90 |
| 2001 | 0.85 | 87 |
| 2000 | 2.87 | 57 |
| 1999 | -2.24 | 108 |
| 1998 | 3.5 | 55 |
| 1997 | 6.17 | 26 |
| 1996 | 7.91 | 22 |
| 1995 | 8.24 | 19 |
| 1994 | 6.57 | 15 |
| 1993 | 5.79 | 21 |
| 1992 | 12.01 | 5 |
| 1991 | 7.13 | 15 |
| 1990 | 0.52 | 55 |
| 1989 | 8.31 | 10 |
| 1988 | 5.23 | 24 |
| 1987 | 5.44 | 17 |
| 1986 | 3.39 | 32 |