| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.288 | 103 |
| 2015 | 0.589 | 134 |
| 2014 | 0.84 | 140 |
| 2013 | 1.332 | 132 |
| 2012 | 1.082 | 141 |
| 2011 | 0.956 | 146 |
| 2010 | 1.213 | 141 |
| 2009 | 2.011 | 131 |
| 2008 | 3.043 | 132 |
| 2007 | 3.205 | 133 |
| 2006 | 3.297 | 115 |
| 2005 | 3.457 | 99 |
| 2004 | 2.695 | 107 |
| 2003 | 3.086 | 106 |
| 2002 | 3.758 | 103 |
| 2001 | 6.234 | 70 |
| 2000 | 8.257 | 63 |
| 1999 | 11.602 | 41 |
| 1998 | 15.454 | 34 |
| 1997 | 16.363 | 29 |
| 1996 | 26.404 | 18 |
| 1995 | 39.823 | 12 |
| 1994 | 15.029 | 32 |
| 1993 | 16.686 | 31 |
| 1992 | 15.882 | 34 |
| 1991 | 17.965 | 31 |
| 1990 | 30.404 | 13 |
| 1989 | 33.372 | 11 |
| 1988 | 55.224 | 7 |
| 1987 | 94.959 | 4 |
| 1986 | 78.433 | 5 |