| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.14 | 95 |
| 2015 | 1.13 | 99 |
| 2014 | 1.05 | 106 |
| 2013 | 1 | 114 |
| 2012 | 0.93 | 119 |
| 2011 | 0.92 | 115 |
| 2010 | 0.91 | 118 |
| 2009 | 0.77 | 129 |
| 2008 | 0.71 | 135 |
| 2007 | 0.77 | 125 |
| 2006 | 0.79 | 122 |
| 2005 | 0.82 | 132 |
| 2004 | 0.99 | 123 |
| 2003 | 1.07 | 117 |
| 2002 | 1.3 | 104 |
| 2001 | 1.45 | 91 |
| 2000 | 1.33 | 99 |
| 1999 | 1.33 | 97 |
| 1998 | 1.44 | 90 |
| 1997 | 1.54 | 87 |
| 1996 | 1.56 | 84 |
| 1995 | 1.63 | 86 |
| 1994 | 1.29 | 109 |
| 1993 | 1.38 | 106 |
| 1992 | 2.11 | 71 |
| 1991 | 2.18 | 72 |
| 1990 | 2.05 | 77 |
| 1989 | 2.38 | 62 |
| 1988 | 2.45 | 57 |