| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 91.89 | 2 |
| 2015 | 92.02 | 2 |
| 2014 | 92.11 | 2 |
| 2013 | 92.16 | 2 |
| 2012 | 92.2 | 2 |
| 2011 | 92.24 | 2 |
| 2010 | 92.29 | 2 |
| 2009 | 92.32 | 2 |
| 2008 | 92.35 | 2 |
| 2007 | 92.4 | 2 |
| 2006 | 92.49 | 2 |
| 2005 | 92.62 | 2 |
| 2004 | 92.75 | 2 |
| 2003 | 92.94 | 1 |
| 2002 | 93.14 | 1 |
| 2001 | 93.34 | 1 |
| 2000 | 93.51 | 1 |
| 1999 | 93.61 | 1 |
| 1998 | 93.67 | 1 |
| 1997 | 93.69 | 2 |
| 1996 | 93.65 | 2 |
| 1995 | 93.54 | 2 |
| 1994 | 93.32 | 2 |
| 1993 | 92.99 | 2 |
| 1992 | 92.57 | 2 |
| 1991 | 92.08 | 3 |
| 1990 | 91.55 | 5 |