| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 87.18 | 4 |
| 2015 | 87.14 | 4 |
| 2014 | 87.01 | 4 |
| 2013 | 87.06 | 4 |
| 2012 | 87.11 | 4 |
| 2011 | 87.14 | 7 |
| 2010 | 87.15 | 7 |
| 2009 | 87.21 | 5 |
| 2008 | 87.19 | 5 |
| 2007 | 87.2 | 6 |
| 2006 | 88.3 | 3 |
| 2005 | 86.36 | 8 |
| 2004 | 87.23 | 7 |
| 2003 | 88.14 | 3 |
| 2002 | 87.11 | 5 |
| 2001 | 88.08 | 3 |
| 2000 | 87.64 | 5 |
| 1999 | 87.91 | 5 |
| 1998 | 87.9 | 4 |
| 1997 | 88.07 | 4 |
| 1996 | 87.95 | 4 |
| 1995 | 87.81 | 7 |
| 1994 | 87.78 | 6 |
| 1993 | 87.19 | 10 |
| 1992 | 88.08 | 5 |
| 1991 | 87.62 | 9 |