| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 82.07 | 14 |
| 2015 | 81.85 | 15 |
| 2014 | 81.16 | 18 |
| 2013 | 80.92 | 20 |
| 2012 | 86.07 | 9 |
| 2011 | 82.44 | 14 |
| 2010 | 82.75 | 13 |
| 2009 | 84.26 | 13 |
| 2008 | 85.24 | 11 |
| 2007 | 86.18 | 9 |
| 2006 | 87.39 | 7 |
| 2005 | 85.77 | 10 |
| 2004 | 83.83 | 12 |
| 2003 | 83.9 | 12 |
| 2002 | 84.35 | 11 |
| 2001 | 85.96 | 9 |
| 2000 | 86.14 | 8 |
| 1999 | 86.07 | 8 |
| 1998 | 85.92 | 11 |
| 1997 | 86.21 | 10 |
| 1996 | 85.45 | 14 |
| 1995 | 86.69 | 12 |
| 1994 | 86.5 | 13 |
| 1993 | 87.15 | 12 |
| 1992 | 87.74 | 7 |
| 1991 | 87.46 | 11 |