| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 72.98 | 73 |
| 2015 | 72.99 | 73 |
| 2014 | 73.02 | 69 |
| 2013 | 73.06 | 69 |
| 2012 | 73.12 | 67 |
| 2011 | 73.19 | 66 |
| 2010 | 73.26 | 66 |
| 2009 | 73.32 | 65 |
| 2008 | 73.39 | 65 |
| 2007 | 73.46 | 64 |
| 2006 | 73.53 | 59 |
| 2005 | 73.6 | 57 |
| 2004 | 73.67 | 57 |
| 2003 | 73.74 | 56 |
| 2002 | 73.81 | 55 |
| 2001 | 73.88 | 54 |
| 2000 | 73.99 | 54 |
| 1999 | 74.12 | 54 |
| 1998 | 74.25 | 53 |
| 1997 | 74.38 | 52 |
| 1996 | 74.51 | 50 |
| 1995 | 74.64 | 50 |
| 1994 | 74.77 | 48 |
| 1993 | 74.9 | 48 |
| 1992 | 75.03 | 48 |
| 1991 | 75.16 | 45 |
| 1990 | 75.22 | 44 |
| 1989 | 75.25 | 42 |
| 1988 | 75.28 | 41 |
| 1987 | 75.31 | 41 |
| 1986 | 75.34 | 40 |