| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 68.13 | 142 |
| 2015 | 68.46 | 137 |
| 2014 | 68.75 | 133 |
| 2013 | 69.14 | 128 |
| 2012 | 68.67 | 134 |
| 2011 | 68.41 | 138 |
| 2010 | 68.47 | 136 |
| 2009 | 69.3 | 132 |
| 2008 | 69.6 | 133 |
| 2007 | 70.47 | 123 |
| 2006 | 70.84 | 121 |
| 2005 | 71.29 | 119 |
| 2004 | 71.78 | 118 |
| 2003 | 71.96 | 115 |
| 2002 | 72.24 | 115 |
| 2001 | 72.7 | 115 |
| 2000 | 73.32 | 113 |
| 1999 | 74.02 | 105 |
| 1998 | 74.72 | 100 |
| 1997 | 75.32 | 99 |
| 1996 | 75.98 | 93 |
| 1995 | 76.77 | 92 |
| 1994 | 77.2 | 90 |
| 1993 | 77.99 | 85 |
| 1992 | 78.44 | 83 |
| 1991 | 79.03 | 80 |
| 1990 | 79.34 | 77 |