| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 81.06 | 13 |
| 2015 | 80.99 | 13 |
| 2014 | 80.94 | 13 |
| 2013 | 80.94 | 14 |
| 2012 | 81.47 | 13 |
| 2011 | 81.85 | 14 |
| 2010 | 82.14 | 13 |
| 2009 | 82.42 | 13 |
| 2008 | 82.66 | 11 |
| 2007 | 81.75 | 12 |
| 2006 | 82.44 | 11 |
| 2005 | 82.2 | 11 |
| 2004 | 81.53 | 12 |
| 2003 | 80.81 | 14 |
| 2002 | 80.06 | 15 |
| 2001 | 79.3 | 16 |
| 2000 | 78.53 | 17 |
| 1999 | 77.75 | 19 |
| 1998 | 76.98 | 22 |
| 1997 | 77 | 23 |
| 1996 | 77.03 | 23 |
| 1995 | 77.07 | 22 |
| 1994 | 77.13 | 22 |
| 1993 | 77.19 | 22 |
| 1992 | 77.27 | 23 |
| 1991 | 77.33 | 23 |
| 1990 | 77.38 | 23 |