| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 79.07 | 28 |
| 2015 | 79.13 | 29 |
| 2014 | 79.21 | 28 |
| 2013 | 79.87 | 26 |
| 2012 | 79.55 | 27 |
| 2011 | 79.68 | 27 |
| 2010 | 79.79 | 25 |
| 2009 | 79.92 | 25 |
| 2008 | 80 | 27 |
| 2007 | 80.06 | 26 |
| 2006 | 80.13 | 26 |
| 2005 | 80.23 | 22 |
| 2004 | 80.33 | 22 |
| 2003 | 80.55 | 20 |
| 2002 | 80.55 | 23 |
| 2001 | 80.63 | 22 |
| 2000 | 80.74 | 24 |
| 1999 | 80.75 | 24 |
| 1998 | 80.84 | 24 |
| 1997 | 80.89 | 25 |
| 1996 | 81.21 | 26 |
| 1995 | 81.18 | 26 |
| 1994 | 81.18 | 28 |
| 1993 | 81.43 | 27 |
| 1992 | 81.57 | 26 |
| 1991 | 81.65 | 26 |