| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 55.3 | 109 |
| 2015 | 55.58 | 112 |
| 2014 | 55.95 | 113 |
| 2013 | 56.47 | 116 |
| 2012 | 57.1 | 117 |
| 2011 | 57.74 | 118 |
| 2010 | 58.32 | 117 |
| 2009 | 58.99 | 117 |
| 2008 | 59.64 | 117 |
| 2007 | 60.29 | 117 |
| 2006 | 61.02 | 117 |
| 2005 | 61.89 | 116 |
| 2004 | 62.65 | 113 |
| 2003 | 63.5 | 111 |
| 2002 | 64.38 | 108 |
| 2001 | 65.21 | 108 |
| 2000 | 65.93 | 107 |
| 1999 | 66.77 | 107 |
| 1998 | 67.52 | 105 |
| 1997 | 68.2 | 103 |
| 1996 | 68.87 | 103 |
| 1995 | 69.56 | 101 |
| 1994 | 70.41 | 100 |
| 1993 | 71.28 | 99 |
| 1992 | 72.15 | 100 |
| 1991 | 73 | 100 |
| 1990 | 73.79 | 98 |
| 1989 | 74.82 | 99 |
| 1988 | 75.86 | 100 |
| 1987 | 76.91 | 102 |
| 1986 | 77.97 | 102 |