| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 75.47 | 7 |
| 2015 | 75.53 | 7 |
| 2014 | 75.7 | 7 |
| 2013 | 75.66 | 7 |
| 2012 | 76.64 | 8 |
| 2011 | 77.27 | 8 |
| 2010 | 77.89 | 8 |
| 2009 | 78.49 | 5 |
| 2008 | 79.06 | 5 |
| 2007 | 76.92 | 8 |
| 2006 | 75.6 | 9 |
| 2005 | 72.26 | 13 |
| 2004 | 71.96 | 14 |
| 2003 | 71.65 | 14 |
| 2002 | 71.32 | 14 |
| 2001 | 70.98 | 13 |
| 2000 | 70.61 | 13 |
| 1999 | 70.22 | 13 |
| 1998 | 70.16 | 13 |
| 1997 | 70.1 | 13 |
| 1996 | 70.05 | 13 |
| 1995 | 69.99 | 13 |
| 1994 | 70.24 | 14 |
| 1993 | 70.13 | 15 |
| 1992 | 70.31 | 15 |
| 1991 | 70.22 | 16 |