| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 61.65 | 49 |
| 2015 | 61.64 | 48 |
| 2014 | 61.6 | 48 |
| 2013 | 61.6 | 48 |
| 2012 | 61.57 | 48 |
| 2011 | 61.54 | 47 |
| 2010 | 61.47 | 48 |
| 2009 | 61.33 | 50 |
| 2008 | 62.26 | 45 |
| 2007 | 63.24 | 43 |
| 2006 | 64.26 | 38 |
| 2005 | 65.31 | 35 |
| 2004 | 66.26 | 33 |
| 2003 | 67.21 | 29 |
| 2002 | 68.13 | 29 |
| 2001 | 69.06 | 28 |
| 2000 | 69.98 | 25 |
| 1999 | 70.91 | 23 |
| 1998 | 71.85 | 20 |
| 1997 | 72.78 | 18 |
| 1996 | 73.69 | 15 |
| 1995 | 74.59 | 13 |
| 1994 | 75.43 | 13 |
| 1993 | 76.25 | 12 |
| 1992 | 77.05 | 11 |
| 1991 | 77.83 | 10 |
| 1990 | 78.61 | 9 |