| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 68.75 | 89 |
| 2015 | 68.61 | 90 |
| 2014 | 68.5 | 90 |
| 2013 | 68.28 | 90 |
| 2012 | 68.02 | 92 |
| 2011 | 67.36 | 95 |
| 2010 | 66.69 | 103 |
| 2009 | 66.49 | 103 |
| 2008 | 66.56 | 108 |
| 2007 | 65.88 | 110 |
| 2006 | 65.36 | 114 |
| 2005 | 65.17 | 117 |
| 2004 | 64.97 | 118 |
| 2003 | 65.01 | 116 |
| 2002 | 64.88 | 122 |
| 2001 | 65.21 | 120 |
| 2000 | 65.15 | 121 |
| 1999 | 65.02 | 123 |
| 1998 | 65.5 | 118 |
| 1997 | 65.45 | 120 |
| 1996 | 66.03 | 117 |
| 1995 | 66.95 | 110 |
| 1994 | 67 | 113 |
| 1993 | 67.09 | 112 |
| 1992 | 66.69 | 120 |
| 1991 | 66.63 | 122 |