| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 65.4 | 73 |
| 2015 | 65.43 | 73 |
| 2014 | 65.49 | 73 |
| 2013 | 65.73 | 72 |
| 2012 | 65.16 | 76 |
| 2011 | 63.49 | 89 |
| 2010 | 65.44 | 72 |
| 2009 | 66.01 | 67 |
| 2008 | 65.79 | 69 |
| 2007 | 64.21 | 86 |
| 2006 | 63.68 | 90 |
| 2005 | 64.55 | 80 |
| 2004 | 64.28 | 76 |
| 2003 | 63.81 | 80 |
| 2002 | 63.53 | 84 |
| 2001 | 63.46 | 85 |
| 2000 | 63.35 | 83 |
| 1999 | 63.23 | 84 |
| 1998 | 63.73 | 80 |
| 1997 | 62.44 | 89 |
| 1996 | 62.39 | 91 |
| 1995 | 62.34 | 90 |
| 1994 | 61.26 | 100 |
| 1993 | 60.89 | 103 |
| 1992 | 59.93 | 109 |
| 1991 | 58.91 | 122 |
| 1990 | 59.2 | 116 |