| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 72.87 | 24 |
| 2015 | 73.3 | 23 |
| 2014 | 73.72 | 23 |
| 2013 | 74.13 | 23 |
| 2012 | 74.53 | 23 |
| 2011 | 74.93 | 24 |
| 2010 | 75.31 | 24 |
| 2009 | 75.69 | 25 |
| 2008 | 76.05 | 24 |
| 2007 | 76.41 | 25 |
| 2006 | 76.76 | 25 |
| 2005 | 77.11 | 23 |
| 2004 | 77.44 | 23 |
| 2003 | 77.76 | 21 |
| 2002 | 78.09 | 20 |
| 2001 | 78.4 | 19 |
| 2000 | 78.72 | 19 |
| 1999 | 79.03 | 19 |
| 1998 | 79.34 | 20 |
| 1997 | 79.64 | 20 |
| 1996 | 79.95 | 20 |
| 1995 | 80.24 | 20 |
| 1994 | 80.54 | 20 |
| 1993 | 80.83 | 21 |
| 1992 | 81.12 | 21 |
| 1991 | 81.4 | 21 |
| 1990 | 81.68 | 20 |
| 1989 | 81.96 | 20 |
| 1988 | 82.24 | 20 |
| 1987 | 82.51 | 20 |
| 1986 | 82.78 | 20 |