| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 65.35 | 113 |
| 2015 | 65.61 | 109 |
| 2014 | 66 | 108 |
| 2013 | 66.36 | 105 |
| 2012 | 66.7 | 101 |
| 2011 | 67.36 | 96 |
| 2010 | 68.12 | 91 |
| 2009 | 68.41 | 90 |
| 2008 | 68.95 | 96 |
| 2007 | 69.45 | 90 |
| 2006 | 69.8 | 86 |
| 2005 | 70.01 | 83 |
| 2004 | 70.22 | 80 |
| 2003 | 70.32 | 77 |
| 2002 | 71.82 | 68 |
| 2001 | 70.89 | 78 |
| 2000 | 71.48 | 72 |
| 1999 | 72.57 | 69 |
| 1998 | 73.05 | 66 |
| 1997 | 73.04 | 69 |
| 1996 | 73.3 | 68 |
| 1995 | 73.22 | 72 |
| 1994 | 72.99 | 73 |
| 1993 | 73.31 | 74 |
| 1992 | 72.87 | 73 |
| 1991 | 72.73 | 79 |