| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 1.67 | 85 |
| 2014 | 4.31 | 61 |
| 2013 | 2.95 | 84 |
| 2012 | 3.66 | 95 |
| 2011 | 4.81 | 95 |
| 2010 | 7.79 | 29 |
| 2009 | 4.69 | 62 |
| 2008 | 6.55 | 116 |
| 2007 | 2.8 | 128 |
| 2006 | 4.42 | 91 |
| 2005 | 5.63 | 72 |
| 2004 | 4.22 | 76 |
| 2003 | 7.32 | 48 |
| 2002 | 7.59 | 47 |
| 2001 | 8.83 | 35 |
| 2000 | 4.8 | 61 |
| 1999 | 0.37 | 140 |
| 1998 | 7.94 | 58 |
| 1997 | 3.02 | 111 |
| 1996 | 4.54 | 104 |
| 1995 | 19.87 | 47 |
| 1994 | 31.84 | 42 |
| 1993 | 5.45 | 85 |
| 1992 | -4.28 | 139 |
| 1991 | -3.43 | 137 |
| 1990 | 0.86 | 127 |
| 1989 | 6.17 | 81 |
| 1988 | 2.52 | 102 |
| 1987 | -13.17 | 129 |
| 1986 | -17.64 | 127 |