| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 87.39 | 10 |
| 2015 | 87.31 | 10 |
| 2014 | 87.23 | 10 |
| 2013 | 87.64 | 10 |
| 2012 | 88.06 | 10 |
| 2011 | 88.42 | 10 |
| 2010 | 88.7 | 9 |
| 2009 | 89.03 | 9 |
| 2008 | 89.34 | 9 |
| 2007 | 89.63 | 7 |
| 2006 | 89.9 | 8 |
| 2005 | 90.17 | 8 |
| 2004 | 90.48 | 7 |
| 2003 | 88.53 | 12 |
| 2002 | 86.31 | 13 |
| 2001 | 83.9 | 25 |
| 2000 | 81.36 | 49 |
| 1999 | 78.84 | 72 |
| 1998 | 79.62 | 66 |
| 1997 | 80.24 | 62 |
| 1996 | 80.32 | 66 |
| 1995 | 80.37 | 68 |
| 1994 | 80.31 | 68 |
| 1993 | 80.2 | 71 |
| 1992 | 80.04 | 71 |
| 1991 | 79.81 | 73 |
| 1990 | 79.49 | 74 |