| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 82.02 | 12 |
| 2015 | 82.04 | 12 |
| 2014 | 82.02 | 12 |
| 2013 | 81.97 | 12 |
| 2012 | 81.92 | 12 |
| 2011 | 81.85 | 13 |
| 2010 | 81.8 | 14 |
| 2009 | 81.7 | 15 |
| 2008 | 81.61 | 13 |
| 2007 | 81.53 | 14 |
| 2006 | 81.47 | 12 |
| 2005 | 81.42 | 12 |
| 2004 | 81.34 | 13 |
| 2003 | 81.27 | 13 |
| 2002 | 81.23 | 14 |
| 2001 | 81.22 | 13 |
| 2000 | 81.24 | 12 |
| 1999 | 82.04 | 10 |
| 1998 | 82.09 | 10 |
| 1997 | 82.2 | 10 |
| 1996 | 82.35 | 10 |
| 1995 | 82.51 | 10 |
| 1994 | 82.62 | 10 |
| 1993 | 82.7 | 10 |
| 1992 | 82.74 | 10 |
| 1991 | 82.74 | 11 |
| 1990 | 82.69 | 11 |