| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.61 | 122 |
| 2015 | 0.7 | 129 |
| 2014 | 0.89 | 122 |
| 2013 | 1.24 | 94 |
| 2012 | 0.82 | 126 |
| 2011 | 0.66 | 127 |
| 2010 | 0.72 | 127 |
| 2009 | 0.95 | 119 |
| 2008 | 0.84 | 127 |
| 2007 | 0.76 | 126 |
| 2006 | 0.78 | 125 |
| 2005 | 1.05 | 121 |
| 2004 | 0.63 | 141 |
| 2003 | 0.41 | 149 |
| 2002 | 0.42 | 142 |
| 2001 | 0.74 | 130 |
| 2000 | 0.67 | 131 |
| 1999 | 0.81 | 125 |
| 1998 | 0.83 | 123 |
| 1997 | 0.99 | 120 |
| 1996 | 0.88 | 124 |
| 1995 | 0.79 | 129 |
| 1994 | 1.44 | 102 |
| 1993 | 1.24 | 113 |
| 1992 | 1.4 | 103 |
| 1991 | 1.08 | 105 |
| 1990 | 1.29 | 97 |
| 1989 | 1.43 | 92 |
| 1988 | 1.46 | 92 |
| 1987 | 1.83 | 81 |
| 1986 | 2.09 | 68 |