| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 73.11 | 23 |
| 2015 | 73.22 | 24 |
| 2014 | 73.31 | 24 |
| 2013 | 73.38 | 25 |
| 2012 | 73.43 | 26 |
| 2011 | 73.47 | 28 |
| 2010 | 73.48 | 28 |
| 2009 | 73.5 | 27 |
| 2008 | 73.52 | 27 |
| 2007 | 73.53 | 28 |
| 2006 | 73.55 | 28 |
| 2005 | 73.57 | 29 |
| 2004 | 73.58 | 31 |
| 2003 | 73.6 | 32 |
| 2002 | 73.57 | 32 |
| 2001 | 73.54 | 31 |
| 2000 | 73.51 | 33 |
| 1999 | 73.24 | 34 |
| 1998 | 72.72 | 38 |
| 1997 | 72.19 | 38 |
| 1996 | 71.66 | 40 |
| 1995 | 71.12 | 41 |
| 1994 | 70.58 | 45 |
| 1993 | 70.03 | 48 |
| 1992 | 69.47 | 51 |
| 1991 | 68.91 | 57 |
| 1990 | 68.34 | 59 |
| 1989 | 67.77 | 59 |
| 1988 | 67.39 | 59 |
| 1987 | 67.18 | 63 |
| 1986 | 66.97 | 63 |