| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 81.64 | 17 |
| 2015 | 81.59 | 17 |
| 2014 | 81.54 | 15 |
| 2013 | 81.28 | 18 |
| 2012 | 81.02 | 22 |
| 2011 | 80.77 | 23 |
| 2010 | 80.57 | 23 |
| 2009 | 80.41 | 23 |
| 2008 | 80.34 | 24 |
| 2007 | 80.36 | 24 |
| 2006 | 80.47 | 22 |
| 2005 | 80.67 | 19 |
| 2004 | 80.96 | 17 |
| 2003 | 81.36 | 17 |
| 2002 | 81.83 | 19 |
| 2001 | 82.31 | 18 |
| 2000 | 82.75 | 18 |
| 1999 | 83.23 | 18 |
| 1998 | 83.58 | 17 |
| 1997 | 84.48 | 16 |
| 1996 | 85.33 | 15 |
| 1995 | 86.07 | 14 |
| 1994 | 86.86 | 10 |
| 1993 | 87.59 | 7 |
| 1992 | 88.22 | 4 |
| 1991 | 88.77 | 4 |