| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.48 | 16 |
| 2015 | 76.67 | 15 |
| 2014 | 76.96 | 13 |
| 2013 | 76.32 | 17 |
| 2012 | 78.78 | 9 |
| 2011 | 80.34 | 9 |
| 2010 | 82.31 | 5 |
| 2009 | 84.03 | 3 |
| 2008 | 85.34 | 1 |
| 2007 | 86.85 | 1 |
| 2006 | 86.95 | 1 |
| 2005 | 86.86 | 1 |
| 2004 | 87.01 | 1 |
| 2003 | 86.66 | 1 |
| 2002 | 85.93 | 1 |
| 2001 | 84.33 | 1 |
| 2000 | 85.93 | 1 |
| 1999 | 86 | 1 |
| 1998 | 85.91 | 1 |
| 1997 | 85.92 | 1 |
| 1996 | 86.19 | 2 |
| 1995 | 86.05 | 3 |
| 1994 | 85.78 | 3 |
| 1993 | 85.74 | 3 |
| 1992 | 85.64 | 3 |
| 1991 | 86.11 | 3 |