| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 80.95 | 14 |
| 2015 | 80.88 | 14 |
| 2014 | 80.82 | 15 |
| 2013 | 80.96 | 13 |
| 2012 | 82.12 | 11 |
| 2011 | 85.37 | 3 |
| 2010 | 84.93 | 4 |
| 2009 | 82.43 | 12 |
| 2008 | 79.98 | 17 |
| 2007 | 81.67 | 13 |
| 2006 | 81.33 | 13 |
| 2005 | 80.94 | 14 |
| 2004 | 80.57 | 14 |
| 2003 | 81.76 | 12 |
| 2002 | 82.54 | 10 |
| 2001 | 83.1 | 8 |
| 2000 | 81.19 | 13 |
| 1999 | 79.86 | 14 |
| 1998 | 79 | 15 |
| 1997 | 79.79 | 14 |
| 1996 | 80.41 | 14 |
| 1995 | 80.67 | 14 |
| 1994 | 80.82 | 15 |
| 1993 | 80.8 | 15 |
| 1992 | 80.51 | 15 |
| 1991 | 80.29 | 15 |
| 1990 | 80.19 | 16 |