| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 75.16 | 9 |
| 2015 | 75.2 | 9 |
| 2014 | 75.24 | 9 |
| 2013 | 75.23 | 9 |
| 2012 | 75.18 | 10 |
| 2011 | 75.15 | 10 |
| 2010 | 75.09 | 11 |
| 2009 | 74.99 | 11 |
| 2008 | 74.87 | 11 |
| 2007 | 74.7 | 13 |
| 2006 | 74.52 | 13 |
| 2005 | 73.88 | 12 |
| 2004 | 73.19 | 12 |
| 2003 | 72.48 | 12 |
| 2002 | 71.81 | 13 |
| 2001 | 71.07 | 12 |
| 2000 | 70.32 | 14 |
| 1999 | 69.52 | 14 |
| 1998 | 68.74 | 15 |
| 1997 | 67.88 | 16 |
| 1996 | 67.07 | 20 |
| 1995 | 66.07 | 20 |
| 1994 | 65.21 | 23 |
| 1993 | 64.44 | 25 |
| 1992 | 63.42 | 27 |
| 1991 | 62.41 | 27 |