| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.66 | 14 |
| 2015 | 76.63 | 16 |
| 2014 | 76.59 | 16 |
| 2013 | 76.55 | 14 |
| 2012 | 69.15 | 31 |
| 2011 | 69.13 | 31 |
| 2010 | 68.4 | 32 |
| 2009 | 68.07 | 35 |
| 2008 | 67.71 | 35 |
| 2007 | 67.42 | 37 |
| 2006 | 67.1 | 35 |
| 2005 | 66.78 | 35 |
| 2004 | 66.45 | 37 |
| 2003 | 66.13 | 37 |
| 2002 | 65.78 | 38 |
| 2001 | 65.46 | 42 |
| 2000 | 65.14 | 42 |
| 1999 | 64.8 | 43 |
| 1998 | 64.47 | 41 |
| 1997 | 64.14 | 42 |
| 1996 | 63.82 | 44 |
| 1995 | 63.5 | 46 |
| 1994 | 63.19 | 47 |
| 1993 | 62.85 | 48 |
| 1992 | 62.53 | 53 |
| 1991 | 62.19 | 57 |