| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.46 | 17 |
| 2015 | 76.29 | 18 |
| 2014 | 76.16 | 18 |
| 2013 | 76.16 | 19 |
| 2012 | 76.21 | 19 |
| 2011 | 76.28 | 18 |
| 2010 | 76.4 | 18 |
| 2009 | 76.62 | 16 |
| 2008 | 76.84 | 16 |
| 2007 | 77.11 | 14 |
| 2006 | 77.39 | 12 |
| 2005 | 77.73 | 11 |
| 2004 | 77.25 | 12 |
| 2003 | 77.81 | 12 |
| 2002 | 78.3 | 10 |
| 2001 | 78.51 | 10 |
| 2000 | 78.69 | 10 |
| 1999 | 78.86 | 9 |
| 1998 | 79.06 | 9 |
| 1997 | 79.1 | 10 |
| 1996 | 79.3 | 9 |
| 1995 | 78.92 | 11 |
| 1994 | 79.08 | 11 |
| 1993 | 79.27 | 9 |
| 1992 | 79.38 | 9 |
| 1991 | 79.64 | 9 |