| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 77.52 | 16 |
| 2015 | 77.58 | 17 |
| 2014 | 77.62 | 18 |
| 2013 | 77.66 | 18 |
| 2012 | 77.68 | 18 |
| 2011 | 77.7 | 19 |
| 2010 | 77.7 | 19 |
| 2009 | 77.7 | 19 |
| 2008 | 77.69 | 20 |
| 2007 | 77.68 | 20 |
| 2006 | 77.68 | 21 |
| 2005 | 77.67 | 22 |
| 2004 | 77.67 | 22 |
| 2003 | 77.67 | 23 |
| 2002 | 77.67 | 23 |
| 2001 | 77.67 | 23 |
| 2000 | 77.67 | 25 |
| 1999 | 77.25 | 25 |
| 1998 | 76.69 | 28 |
| 1997 | 76.11 | 31 |
| 1996 | 75.53 | 32 |
| 1995 | 74.93 | 32 |
| 1994 | 74.45 | 35 |
| 1993 | 74.38 | 35 |
| 1992 | 74.31 | 35 |
| 1991 | 74.25 | 36 |
| 1990 | 74.18 | 38 |
| 1989 | 74.12 | 40 |
| 1988 | 74.05 | 41 |
| 1987 | 73.98 | 43 |
| 1986 | 73.92 | 44 |