| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 83.87 | 2 |
| 2015 | 84.46 | 2 |
| 2014 | 84.41 | 2 |
| 2013 | 84.77 | 2 |
| 2012 | 84.26 | 2 |
| 2011 | 85.49 | 2 |
| 2010 | 86.17 | 1 |
| 2009 | 84.8 | 2 |
| 2008 | 83.36 | 4 |
| 2007 | 81.72 | 4 |
| 2006 | 79.35 | 10 |
| 2005 | 78.36 | 10 |
| 2004 | 76.21 | 15 |
| 2003 | 73.93 | 18 |
| 2002 | 72.47 | 22 |
| 2001 | 71.7 | 24 |
| 2000 | 74.62 | 17 |
| 1999 | 76.02 | 14 |
| 1998 | 76.45 | 12 |
| 1997 | 75.49 | 15 |
| 1996 | 78.79 | 11 |
| 1995 | 79.46 | 9 |
| 1994 | 79.34 | 10 |
| 1993 | 79.17 | 11 |
| 1992 | 78.96 | 10 |
| 1991 | 79.03 | 11 |