| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 77.61 | 23 |
| 2015 | 77.39 | 23 |
| 2014 | 77.18 | 25 |
| 2013 | 77.19 | 24 |
| 2012 | 77.26 | 23 |
| 2011 | 77.34 | 22 |
| 2010 | 77.47 | 21 |
| 2009 | 77.7 | 20 |
| 2008 | 77.92 | 20 |
| 2007 | 78.2 | 19 |
| 2006 | 78.49 | 18 |
| 2005 | 78.83 | 18 |
| 2004 | 79.16 | 18 |
| 2003 | 79.47 | 17 |
| 2002 | 79.74 | 16 |
| 2001 | 79.99 | 14 |
| 2000 | 80.2 | 14 |
| 1999 | 80.4 | 13 |
| 1998 | 80.64 | 13 |
| 1997 | 80.7 | 13 |
| 1996 | 80.87 | 12 |
| 1995 | 81.03 | 12 |
| 1994 | 81.14 | 12 |
| 1993 | 81.29 | 13 |
| 1992 | 81.34 | 13 |
| 1991 | 81.38 | 13 |
| 1990 | 81.38 | 14 |