| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 79.06 | 14 |
| 2015 | 79.28 | 14 |
| 2014 | 79.49 | 14 |
| 2013 | 79.68 | 14 |
| 2012 | 79.86 | 14 |
| 2011 | 80.03 | 14 |
| 2010 | 80.19 | 13 |
| 2009 | 80.33 | 14 |
| 2008 | 80.47 | 13 |
| 2007 | 80.59 | 13 |
| 2006 | 80.71 | 14 |
| 2005 | 80.83 | 14 |
| 2004 | 80.95 | 15 |
| 2003 | 81.06 | 15 |
| 2002 | 81.18 | 15 |
| 2001 | 81.3 | 16 |
| 2000 | 81.41 | 16 |
| 1999 | 81.53 | 16 |
| 1998 | 81.65 | 15 |
| 1997 | 81.94 | 16 |
| 1996 | 82.32 | 16 |
| 1995 | 82.69 | 16 |
| 1994 | 83.05 | 17 |
| 1993 | 83.41 | 16 |
| 1992 | 83.77 | 16 |
| 1991 | 84.11 | 15 |
| 1990 | 84.45 | 15 |
| 1989 | 84.79 | 14 |
| 1988 | 85.12 | 14 |
| 1987 | 85.44 | 15 |
| 1986 | 85.76 | 15 |