| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 10.26 | 56 |
| 2015 | 17.11 | 30 |
| 2014 | 8.1 | 93 |
| 2013 | 2.85 | 142 |
| 2012 | 15.99 | 41 |
| 2011 | 9.57 | 90 |
| 2010 | 19.41 | 44 |
| 2009 | 13.34 | 69 |
| 2008 | 11.53 | 105 |
| 2007 | 9.56 | 141 |
| 2006 | 12.5 | 120 |
| 2005 | 7.06 | 133 |
| 2004 | -2.89 | 157 |
| 2003 | -2.07 | 154 |
| 2002 | 11.26 | 83 |
| 2001 | 52.31 | 19 |
| 2000 | 14.53 | 74 |
| 1999 | 18.54 | 55 |
| 1998 | -14.16 | 152 |
| 1997 | -4.24 | 149 |
| 1996 | 9.76 | 104 |
| 1995 | -6.13 | 146 |
| 1994 | 7.31 | 118 |
| 1993 | 3.38 | 118 |
| 1992 | 5.25 | 102 |
| 1991 | 2.98 | 108 |
| 1990 | 3.89 | 103 |
| 1989 | 17.69 | 57 |
| 1988 | 15.53 | 68 |
| 1987 | 26.22 | 37 |
| 1986 | 4.32 | 101 |