| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.48 | 99 |
| 2015 | 7.32 | 86 |
| 2014 | 6.17 | 111 |
| 2013 | 3.77 | 134 |
| 2012 | -4.99 | 154 |
| 2011 | 0.36 | 148 |
| 2010 | 3.15 | 139 |
| 2009 | 3.34 | 128 |
| 2008 | 5.09 | 139 |
| 2007 | 12.17 | 119 |
| 2006 | 2.29 | 160 |
| 2005 | -6.25 | 164 |
| 2004 | 20.22 | 49 |
| 2003 | 6.1 | 122 |
| 2002 | 10.54 | 85 |
| 2001 | 11.03 | 96 |
| 2000 | 13.8 | 77 |
| 1999 | 13.82 | 75 |
| 1998 | 12.28 | 71 |
| 1997 | 10.06 | 102 |
| 1996 | 9.94 | 101 |
| 1995 | 10.5 | 95 |
| 1994 | 12.45 | 93 |
| 1993 | 23.24 | 54 |
| 1992 | 6.63 | 97 |
| 1991 | 5.38 | 100 |
| 1990 | 9.53 | 87 |
| 1989 | 6.68 | 100 |
| 1988 | 22.37 | 43 |
| 1987 | 11.72 | 74 |
| 1986 | 28.06 | 22 |