| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 73.95 | 21 |
| 2015 | 74.38 | 21 |
| 2014 | 74.8 | 21 |
| 2013 | 75.22 | 21 |
| 2012 | 75.63 | 20 |
| 2011 | 76.03 | 21 |
| 2010 | 76.43 | 21 |
| 2009 | 76.82 | 21 |
| 2008 | 77.2 | 21 |
| 2007 | 77.58 | 21 |
| 2006 | 77.96 | 19 |
| 2005 | 78.33 | 18 |
| 2004 | 78.69 | 17 |
| 2003 | 79.05 | 17 |
| 2002 | 79.41 | 17 |
| 2001 | 79.76 | 18 |
| 2000 | 80.11 | 18 |
| 1999 | 80.45 | 18 |
| 1998 | 80.78 | 18 |
| 1997 | 81.1 | 18 |
| 1996 | 81.42 | 19 |
| 1995 | 81.74 | 18 |
| 1994 | 82.05 | 18 |
| 1993 | 82.36 | 18 |
| 1992 | 82.66 | 18 |
| 1991 | 82.96 | 18 |
| 1990 | 83.25 | 18 |
| 1989 | 83.52 | 18 |
| 1988 | 83.62 | 18 |
| 1987 | 83.72 | 18 |
| 1986 | 83.82 | 18 |