| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 84.06 | 4 |
| 2015 | 84.6 | 4 |
| 2014 | 84.59 | 4 |
| 2013 | 85.01 | 4 |
| 2012 | 84.64 | 3 |
| 2011 | 85.99 | 2 |
| 2010 | 86.56 | 2 |
| 2009 | 85.1 | 4 |
| 2008 | 83.65 | 6 |
| 2007 | 82.19 | 11 |
| 2006 | 80.45 | 15 |
| 2005 | 79.6 | 16 |
| 2004 | 77.82 | 20 |
| 2003 | 76.88 | 23 |
| 2002 | 76.05 | 23 |
| 2001 | 75.79 | 26 |
| 2000 | 75.7 | 26 |
| 1999 | 76.24 | 25 |
| 1998 | 76.81 | 23 |
| 1997 | 77.69 | 20 |
| 1996 | 79.03 | 17 |
| 1995 | 79.72 | 16 |
| 1994 | 79.63 | 16 |
| 1993 | 79.5 | 16 |
| 1992 | 79.33 | 17 |
| 1991 | 79.63 | 17 |
| 1990 | 79.72 | 17 |