| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.31 | 80 |
| 2015 | 76.32 | 80 |
| 2014 | 76.31 | 80 |
| 2013 | 76.39 | 77 |
| 2012 | 76.67 | 77 |
| 2011 | 77.27 | 70 |
| 2010 | 76.73 | 72 |
| 2009 | 76.9 | 71 |
| 2008 | 76.67 | 73 |
| 2007 | 76.46 | 77 |
| 2006 | 76.9 | 72 |
| 2005 | 74.13 | 99 |
| 2004 | 74.08 | 97 |
| 2003 | 74 | 97 |
| 2002 | 75.33 | 85 |
| 2001 | 76.59 | 80 |
| 2000 | 75.76 | 89 |
| 1999 | 76.06 | 89 |
| 1998 | 76.32 | 85 |
| 1997 | 76.88 | 84 |
| 1996 | 77.46 | 82 |
| 1995 | 78.08 | 80 |
| 1994 | 77.4 | 86 |
| 1993 | 76.5 | 95 |
| 1992 | 77.54 | 88 |
| 1991 | 77.56 | 88 |
| 1990 | 77.53 | 89 |