| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 77.06 | 13 |
| 2015 | 76.99 | 13 |
| 2014 | 76.94 | 13 |
| 2013 | 76.92 | 13 |
| 2012 | 77.09 | 14 |
| 2011 | 77.27 | 13 |
| 2010 | 77.45 | 14 |
| 2009 | 77.65 | 13 |
| 2008 | 77.85 | 12 |
| 2007 | 78.05 | 12 |
| 2006 | 78.23 | 11 |
| 2005 | 78.4 | 11 |
| 2004 | 77.37 | 12 |
| 2003 | 76.28 | 14 |
| 2002 | 75.14 | 15 |
| 2001 | 73.95 | 17 |
| 2000 | 72.72 | 19 |
| 1999 | 71.44 | 20 |
| 1998 | 71.5 | 21 |
| 1997 | 71.36 | 21 |
| 1996 | 71.4 | 21 |
| 1995 | 71.65 | 20 |
| 1994 | 71.72 | 19 |
| 1993 | 71.71 | 19 |
| 1992 | 71.93 | 20 |
| 1991 | 71.64 | 21 |
| 1990 | 71.39 | 21 |