| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 69.93 | 125 |
| 2015 | 70.16 | 123 |
| 2014 | 70.45 | 121 |
| 2013 | 70.42 | 121 |
| 2012 | 70.51 | 121 |
| 2011 | 70.96 | 116 |
| 2010 | 71.65 | 111 |
| 2009 | 72.2 | 109 |
| 2008 | 72.91 | 107 |
| 2007 | 73.23 | 105 |
| 2006 | 73.1 | 104 |
| 2005 | 73.34 | 102 |
| 2004 | 73.56 | 101 |
| 2003 | 74.32 | 94 |
| 2002 | 74.95 | 89 |
| 2001 | 75.73 | 90 |
| 2000 | 76.38 | 83 |
| 1999 | 76.92 | 82 |
| 1998 | 77.36 | 82 |
| 1997 | 77.81 | 80 |
| 1996 | 77.83 | 81 |
| 1995 | 77.75 | 81 |
| 1994 | 77.94 | 82 |
| 1993 | 78.2 | 84 |
| 1992 | 78.13 | 85 |
| 1991 | 77.67 | 87 |
| 1990 | 77.19 | 94 |