| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 77.88 | 65 |
| 2015 | 77.93 | 65 |
| 2014 | 77.89 | 65 |
| 2013 | 77.88 | 66 |
| 2012 | 77.83 | 63 |
| 2011 | 77.78 | 64 |
| 2010 | 77.75 | 64 |
| 2009 | 78.13 | 63 |
| 2008 | 78.49 | 62 |
| 2007 | 78.86 | 57 |
| 2006 | 79.3 | 57 |
| 2005 | 79.84 | 54 |
| 2004 | 80.47 | 53 |
| 2003 | 81.22 | 45 |
| 2002 | 82.01 | 39 |
| 2001 | 82.78 | 34 |
| 2000 | 83.44 | 29 |
| 1999 | 83.86 | 25 |
| 1998 | 84.21 | 24 |
| 1997 | 84.47 | 24 |
| 1996 | 84.67 | 23 |
| 1995 | 84.82 | 24 |
| 1994 | 84.9 | 26 |
| 1993 | 84.92 | 27 |
| 1992 | 84.91 | 27 |
| 1991 | 84.92 | 29 |
| 1990 | 84.97 | 31 |