| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 89.06 | 8 |
| 2015 | 89.09 | 7 |
| 2014 | 89.12 | 7 |
| 2013 | 89.31 | 8 |
| 2012 | 89.51 | 8 |
| 2011 | 90.32 | 5 |
| 2010 | 90.97 | 4 |
| 2009 | 90.67 | 4 |
| 2008 | 90.33 | 6 |
| 2007 | 89.95 | 6 |
| 2006 | 89.56 | 9 |
| 2005 | 89.15 | 10 |
| 2004 | 89.28 | 11 |
| 2003 | 89.4 | 11 |
| 2002 | 89.5 | 10 |
| 2001 | 89.58 | 10 |
| 2000 | 89.57 | 10 |
| 1999 | 89.46 | 10 |
| 1998 | 89.27 | 10 |
| 1997 | 89.02 | 11 |
| 1996 | 88.79 | 12 |
| 1995 | 88.63 | 13 |
| 1994 | 88.55 | 14 |
| 1993 | 88.54 | 15 |
| 1992 | 88.61 | 16 |
| 1991 | 88.69 | 16 |
| 1990 | 88.78 | 16 |