| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 71.05 | 25 |
| 2015 | 70.98 | 25 |
| 2014 | 70.89 | 25 |
| 2013 | 70.77 | 25 |
| 2012 | 70.68 | 23 |
| 2011 | 70.57 | 24 |
| 2010 | 70.45 | 24 |
| 2009 | 69.77 | 28 |
| 2008 | 69.09 | 27 |
| 2007 | 68.41 | 28 |
| 2006 | 67.74 | 29 |
| 2005 | 67.07 | 31 |
| 2004 | 66.41 | 32 |
| 2003 | 65.76 | 33 |
| 2002 | 65.11 | 37 |
| 2001 | 64.47 | 36 |
| 2000 | 63.82 | 39 |
| 1999 | 63.15 | 41 |
| 1998 | 62.49 | 40 |
| 1997 | 61.81 | 41 |
| 1996 | 61.13 | 41 |
| 1995 | 60.25 | 41 |
| 1994 | 59.31 | 44 |
| 1993 | 58.35 | 48 |
| 1992 | 57.36 | 58 |
| 1991 | 56.35 | 61 |
| 1990 | 55.32 | 65 |