| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 72.12 | 68 |
| 2015 | 72 | 70 |
| 2014 | 71.37 | 74 |
| 2013 | 70.8 | 78 |
| 2012 | 71.29 | 73 |
| 2011 | 71.59 | 73 |
| 2010 | 70.71 | 79 |
| 2009 | 70 | 83 |
| 2008 | 70.71 | 82 |
| 2007 | 71.19 | 78 |
| 2006 | 71.51 | 73 |
| 2005 | 70.48 | 80 |
| 2004 | 68.34 | 92 |
| 2003 | 67.43 | 98 |
| 2002 | 65.65 | 111 |
| 2001 | 68.82 | 94 |
| 2000 | 69.08 | 89 |
| 1999 | 68.94 | 91 |
| 1998 | 67.71 | 99 |
| 1997 | 68.57 | 98 |
| 1996 | 68.55 | 100 |
| 1995 | 68.64 | 100 |
| 1994 | 68.7 | 99 |
| 1993 | 68.74 | 102 |
| 1992 | 68.78 | 105 |
| 1991 | 68.84 | 105 |