| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 62.76 | 133 |
| 2015 | 61.81 | 130 |
| 2014 | 61.31 | 128 |
| 2013 | 60.39 | 127 |
| 2012 | 59.3 | 122 |
| 2011 | 58.52 | 120 |
| 2010 | 58.38 | 118 |
| 2009 | 58.41 | 116 |
| 2008 | 58.93 | 115 |
| 2007 | 59.82 | 115 |
| 2006 | 60.86 | 116 |
| 2005 | 61.88 | 115 |
| 2004 | 63.44 | 117 |
| 2003 | 65.19 | 117 |
| 2002 | 67.07 | 116 |
| 2001 | 68.97 | 117 |
| 2000 | 70.82 | 117 |
| 1999 | 72.82 | 118 |
| 1998 | 74.62 | 119 |
| 1997 | 76.24 | 118 |
| 1996 | 77.86 | 119 |
| 1995 | 79.61 | 119 |
| 1994 | 80.88 | 121 |
| 1993 | 82.06 | 122 |
| 1992 | 83.05 | 121 |
| 1991 | 83.6 | 122 |
| 1990 | 83.53 | 122 |
| 1989 | 83.76 | 120 |
| 1988 | 83.64 | 119 |
| 1987 | 83.31 | 118 |
| 1986 | 82.97 | 114 |