| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 68.72 | 131 |
| 2015 | 68.76 | 131 |
| 2014 | 68.82 | 131 |
| 2013 | 69.07 | 129 |
| 2012 | 69.28 | 129 |
| 2011 | 69.57 | 125 |
| 2010 | 70.14 | 121 |
| 2009 | 70.63 | 119 |
| 2008 | 71.64 | 118 |
| 2007 | 72.5 | 111 |
| 2006 | 71.25 | 119 |
| 2005 | 69.67 | 128 |
| 2004 | 71.94 | 115 |
| 2003 | 71.55 | 120 |
| 2002 | 71.1 | 126 |
| 2001 | 73.26 | 111 |
| 2000 | 73.84 | 105 |
| 1999 | 74.43 | 102 |
| 1998 | 74.97 | 97 |
| 1997 | 75.47 | 95 |
| 1996 | 75.93 | 95 |
| 1995 | 76.33 | 93 |
| 1994 | 76.63 | 95 |
| 1993 | 76.87 | 92 |
| 1992 | 77.07 | 91 |
| 1991 | 77.2 | 91 |
| 1990 | 77.24 | 93 |