| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 82.36 | 33 |
| 2015 | 82.24 | 34 |
| 2014 | 82.13 | 34 |
| 2013 | 82.46 | 32 |
| 2012 | 82.71 | 28 |
| 2011 | 82.94 | 27 |
| 2010 | 82.83 | 26 |
| 2009 | 83.15 | 25 |
| 2008 | 83.26 | 26 |
| 2007 | 83.84 | 22 |
| 2006 | 84.68 | 19 |
| 2005 | 84.08 | 24 |
| 2004 | 83.47 | 26 |
| 2003 | 83.36 | 27 |
| 2002 | 83.25 | 27 |
| 2001 | 83.49 | 28 |
| 2000 | 83.71 | 26 |
| 1999 | 83.5 | 29 |
| 1998 | 83.14 | 36 |
| 1997 | 83.46 | 33 |
| 1996 | 83.33 | 37 |
| 1995 | 83.19 | 41 |
| 1994 | 83.36 | 38 |
| 1993 | 83 | 41 |
| 1992 | 84.29 | 35 |
| 1991 | 84.31 | 35 |
| 1990 | 84.6 | 32 |