| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 79.48 | 17 |
| 2015 | 80.06 | 16 |
| 2014 | 80.14 | 16 |
| 2013 | 80.38 | 16 |
| 2012 | 80.64 | 16 |
| 2011 | 80.78 | 15 |
| 2010 | 80.7 | 16 |
| 2009 | 79.55 | 18 |
| 2008 | 78.84 | 18 |
| 2007 | 78.1 | 20 |
| 2006 | 77.67 | 21 |
| 2005 | 77.82 | 21 |
| 2004 | 76.63 | 24 |
| 2003 | 75.75 | 25 |
| 2002 | 75.35 | 27 |
| 2001 | 75.46 | 27 |
| 2000 | 76.11 | 25 |
| 1999 | 75.43 | 26 |
| 1998 | 74.9 | 26 |
| 1997 | 74.71 | 26 |
| 1996 | 74.87 | 27 |
| 1995 | 75.34 | 26 |
| 1994 | 74.71 | 28 |
| 1993 | 74.04 | 30 |
| 1992 | 73.43 | 34 |
| 1991 | 73 | 33 |
| 1990 | 72.84 | 33 |