| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 82.29 | 11 |
| 2015 | 82.31 | 11 |
| 2014 | 82.31 | 10 |
| 2013 | 82.29 | 11 |
| 2012 | 74.28 | 29 |
| 2011 | 74.26 | 29 |
| 2010 | 73.47 | 30 |
| 2009 | 73.1 | 30 |
| 2008 | 72.75 | 31 |
| 2007 | 72.41 | 32 |
| 2006 | 72.06 | 34 |
| 2005 | 71.72 | 38 |
| 2004 | 71.35 | 38 |
| 2003 | 70.99 | 38 |
| 2002 | 70.62 | 40 |
| 2001 | 70.26 | 41 |
| 2000 | 69.91 | 44 |
| 1999 | 69.54 | 44 |
| 1998 | 69.18 | 47 |
| 1997 | 68.82 | 48 |
| 1996 | 68.46 | 47 |
| 1995 | 68.1 | 48 |
| 1994 | 67.74 | 48 |
| 1993 | 67.37 | 49 |
| 1992 | 67 | 52 |
| 1991 | 66.63 | 57 |
| 1990 | 66.24 | 62 |