| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 10.87 | 53 |
| 2015 | 8.03 | 81 |
| 2014 | 3.38 | 136 |
| 2013 | 6.7 | 114 |
| 2012 | 10.94 | 72 |
| 2011 | 17.34 | 42 |
| 2010 | 10.25 | 97 |
| 2009 | 21.88 | 31 |
| 2008 | 7.84 | 125 |
| 2007 | 27.76 | 46 |
| 2006 | 38.88 | 21 |
| 2005 | 29.49 | 30 |
| 2004 | 14.79 | 74 |
| 2003 | -4.45 | 158 |
| 2002 | 7.26 | 110 |
| 2001 | 6.25 | 121 |
| 2000 | 5.01 | 125 |
| 1999 | 9.17 | 107 |
| 1998 | 2.46 | 129 |
| 1997 | 7.69 | 119 |
| 1996 | 30.74 | 33 |
| 1995 | 13.75 | 85 |
| 1994 | -1.28 | 142 |
| 1993 | 17.79 | 68 |
| 1992 | 12.51 | 83 |
| 1991 | 17.65 | 63 |
| 1990 | 4.25 | 101 |
| 1989 | 5.35 | 107 |
| 1988 | 4.41 | 106 |
| 1987 | 1.54 | 111 |
| 1986 | 13.27 | 65 |