| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 75.6 | 47 |
| 2015 | 75.52 | 47 |
| 2014 | 75.42 | 48 |
| 2013 | 75.36 | 48 |
| 2012 | 75.27 | 49 |
| 2011 | 75.2 | 48 |
| 2010 | 75.13 | 47 |
| 2009 | 75.07 | 45 |
| 2008 | 75.03 | 48 |
| 2007 | 75.01 | 49 |
| 2006 | 74.99 | 51 |
| 2005 | 75.17 | 50 |
| 2004 | 75.32 | 50 |
| 2003 | 75.46 | 48 |
| 2002 | 75.73 | 46 |
| 2001 | 75.93 | 48 |
| 2000 | 76.14 | 44 |
| 1999 | 76.33 | 44 |
| 1998 | 76.64 | 44 |
| 1997 | 76.82 | 45 |
| 1996 | 77.18 | 46 |
| 1995 | 77.13 | 47 |
| 1994 | 77.55 | 45 |
| 1993 | 78.29 | 41 |
| 1992 | 78.43 | 42 |
| 1991 | 78.68 | 41 |