| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 80.07 | 24 |
| 2015 | 80.17 | 24 |
| 2014 | 80.17 | 24 |
| 2013 | 80.56 | 24 |
| 2012 | 80.88 | 23 |
| 2011 | 80.56 | 24 |
| 2010 | 78.34 | 31 |
| 2009 | 79.88 | 26 |
| 2008 | 80.21 | 25 |
| 2007 | 78.41 | 33 |
| 2006 | 78.07 | 32 |
| 2005 | 77.67 | 34 |
| 2004 | 78.51 | 30 |
| 2003 | 77.77 | 33 |
| 2002 | 77.83 | 38 |
| 2001 | 77.51 | 42 |
| 2000 | 78.13 | 39 |
| 1999 | 78.44 | 36 |
| 1998 | 79.68 | 31 |
| 1997 | 80.13 | 31 |
| 1996 | 77.78 | 39 |
| 1995 | 79.02 | 36 |
| 1994 | 79.85 | 34 |
| 1993 | 78 | 44 |
| 1992 | 78.22 | 46 |
| 1991 | 78.43 | 45 |