| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 35.71 | 120 |
| 2014 | 34 | 120 |
| 2013 | 37.26 | 108 |
| 2012 | 34.91 | 109 |
| 2011 | 39.92 | 95 |
| 2010 | 34.81 | 117 |
| 2009 | 31.69 | 122 |
| 2008 | 32.43 | 113 |
| 2007 | 26.98 | 129 |
| 2006 | 24.49 | 129 |
| 2005 | 20.31 | 134 |
| 2004 | 18.25 | 140 |
| 2003 | 13.22 | 153 |
| 2002 | 8.89 | 159 |
| 2001 | 11.23 | 155 |
| 2000 | 11.64 | 153 |
| 1999 | 11.51 | 150 |
| 1998 | 12.79 | 146 |
| 1997 | 6.2 | 156 |
| 1996 | 102.58 | 9 |
| 1995 | 15.13 | 135 |
| 1994 | 12.78 | 137 |
| 1993 | 9.43 | 140 |
| 1992 | 4.09 | 136 |
| 1991 | 2.19 | 134 |
| 1989 | 0.85 | 123 |
| 1988 | 0.53 | 121 |
| 1987 | 0.52 | 119 |
| 1986 | 0.52 | 117 |