| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 85.14 | 15 |
| 2015 | 85.15 | 16 |
| 2014 | 85.14 | 15 |
| 2013 | 85.33 | 15 |
| 2012 | 81.41 | 36 |
| 2011 | 81.39 | 35 |
| 2010 | 80.9 | 40 |
| 2009 | 80.89 | 41 |
| 2008 | 80.89 | 43 |
| 2007 | 80.88 | 46 |
| 2006 | 80.89 | 46 |
| 2005 | 80.9 | 45 |
| 2004 | 80.9 | 47 |
| 2003 | 80.91 | 48 |
| 2002 | 80.93 | 53 |
| 2001 | 80.95 | 54 |
| 2000 | 80.98 | 53 |
| 1999 | 81 | 54 |
| 1998 | 81.03 | 59 |
| 1997 | 81.07 | 54 |
| 1996 | 81.1 | 55 |
| 1995 | 81.14 | 58 |
| 1994 | 81.18 | 56 |
| 1993 | 81.21 | 55 |
| 1992 | 81.24 | 56 |
| 1991 | 81.27 | 58 |
| 1990 | 81.28 | 55 |