| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 38.8 | 135 |
| 2015 | 38.76 | 135 |
| 2014 | 38.72 | 135 |
| 2013 | 38.39 | 137 |
| 2012 | 37.54 | 143 |
| 2011 | 36.52 | 147 |
| 2010 | 37.46 | 142 |
| 2009 | 37.58 | 140 |
| 2008 | 36.99 | 142 |
| 2007 | 36.99 | 139 |
| 2006 | 36.59 | 140 |
| 2005 | 37.1 | 135 |
| 2004 | 36.61 | 136 |
| 2003 | 36.67 | 135 |
| 2002 | 36.38 | 137 |
| 2001 | 35.94 | 139 |
| 2000 | 35.5 | 139 |
| 1999 | 35.06 | 140 |
| 1998 | 34.99 | 139 |
| 1997 | 34.92 | 136 |
| 1996 | 34.57 | 136 |
| 1995 | 34.23 | 136 |
| 1994 | 33.69 | 138 |
| 1993 | 33.1 | 140 |
| 1992 | 33.03 | 141 |
| 1991 | 33.01 | 141 |
| 1990 | 32.71 | 140 |