| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 83.68 | 6 |
| 2015 | 83.67 | 6 |
| 2014 | 83.62 | 6 |
| 2013 | 83.43 | 7 |
| 2012 | 83.21 | 9 |
| 2011 | 83 | 11 |
| 2010 | 82.83 | 12 |
| 2009 | 82.69 | 10 |
| 2008 | 82.63 | 12 |
| 2007 | 82.65 | 10 |
| 2006 | 82.75 | 10 |
| 2005 | 82.92 | 9 |
| 2004 | 83.13 | 9 |
| 2003 | 83.44 | 7 |
| 2002 | 83.79 | 6 |
| 2001 | 84.15 | 6 |
| 2000 | 84.49 | 6 |
| 1999 | 84.88 | 6 |
| 1998 | 85.19 | 5 |
| 1997 | 86.07 | 5 |
| 1996 | 86.89 | 3 |
| 1995 | 87.63 | 2 |
| 1994 | 88.36 | 2 |
| 1993 | 89.02 | 2 |
| 1992 | 89.63 | 1 |
| 1991 | 90.16 | 1 |
| 1990 | 90.63 | 1 |