| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 81.53 | 3 |
| 2015 | 81.91 | 3 |
| 2014 | 82.33 | 3 |
| 2013 | 82.53 | 3 |
| 2012 | 82.65 | 3 |
| 2011 | 82.77 | 2 |
| 2010 | 82.86 | 2 |
| 2009 | 82.04 | 4 |
| 2008 | 80.48 | 4 |
| 2007 | 79.78 | 4 |
| 2006 | 80.68 | 4 |
| 2005 | 81.22 | 4 |
| 2004 | 80.16 | 4 |
| 2003 | 79.07 | 4 |
| 2002 | 78.82 | 5 |
| 2001 | 78.42 | 7 |
| 2000 | 78.25 | 7 |
| 1999 | 80.89 | 4 |
| 1998 | 80.76 | 4 |
| 1997 | 81.64 | 4 |
| 1996 | 82.47 | 4 |
| 1995 | 81.73 | 4 |
| 1994 | 79.95 | 4 |
| 1993 | 82.21 | 4 |
| 1992 | 80.72 | 4 |
| 1991 | 79.07 | 5 |