| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 61.35 | 61 |
| 2015 | 61.15 | 62 |
| 2014 | 60.93 | 67 |
| 2013 | 60.55 | 72 |
| 2012 | 60.13 | 75 |
| 2011 | 59.68 | 76 |
| 2010 | 59.31 | 79 |
| 2009 | 58.92 | 78 |
| 2008 | 58.4 | 92 |
| 2007 | 57.96 | 97 |
| 2006 | 57.58 | 97 |
| 2005 | 57.27 | 98 |
| 2004 | 57.08 | 94 |
| 2003 | 56.88 | 92 |
| 2002 | 56.76 | 92 |
| 2001 | 56.63 | 96 |
| 2000 | 56.49 | 94 |
| 1999 | 56.42 | 95 |
| 1998 | 56.44 | 96 |
| 1997 | 56.4 | 92 |
| 1996 | 56.33 | 95 |
| 1995 | 56.18 | 99 |
| 1994 | 55.95 | 98 |
| 1993 | 55.66 | 102 |
| 1992 | 55.39 | 102 |
| 1991 | 55.05 | 108 |