| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 74.25 | 29 |
| 2015 | 74.09 | 30 |
| 2014 | 73.91 | 31 |
| 2013 | 73.63 | 31 |
| 2012 | 74.68 | 28 |
| 2011 | 74.58 | 27 |
| 2010 | 74.89 | 27 |
| 2009 | 74.84 | 27 |
| 2008 | 75.04 | 26 |
| 2007 | 74.22 | 28 |
| 2006 | 69.54 | 44 |
| 2005 | 68.06 | 50 |
| 2004 | 68.37 | 50 |
| 2003 | 68.64 | 51 |
| 2002 | 70.84 | 39 |
| 2001 | 73.02 | 31 |
| 2000 | 70.04 | 42 |
| 1999 | 72.1 | 34 |
| 1998 | 70.76 | 38 |
| 1997 | 69.8 | 43 |
| 1996 | 67.84 | 48 |
| 1995 | 65.87 | 59 |
| 1994 | 64.21 | 74 |
| 1993 | 62.9 | 86 |
| 1992 | 61.54 | 97 |
| 1991 | 60.09 | 107 |
| 1990 | 61.6 | 96 |