| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 76.61 | 19 |
| 2015 | 76.23 | 20 |
| 2014 | 75.81 | 20 |
| 2013 | 75.36 | 20 |
| 2012 | 74.87 | 21 |
| 2011 | 74.33 | 26 |
| 2010 | 73.76 | 27 |
| 2009 | 73.18 | 28 |
| 2008 | 72.59 | 29 |
| 2007 | 72 | 31 |
| 2006 | 71.39 | 35 |
| 2005 | 70.78 | 38 |
| 2004 | 70.16 | 41 |
| 2003 | 69.54 | 41 |
| 2002 | 68.9 | 44 |
| 2001 | 68.26 | 45 |
| 2000 | 67.87 | 46 |
| 1999 | 67.51 | 50 |
| 1998 | 67.15 | 52 |
| 1997 | 66.78 | 54 |
| 1996 | 66.41 | 61 |
| 1995 | 66.04 | 61 |
| 1994 | 65.67 | 63 |
| 1993 | 65.29 | 64 |
| 1992 | 64.92 | 64 |
| 1991 | 64.54 | 66 |
| 1990 | 64.57 | 67 |
| 1989 | 64.66 | 67 |
| 1988 | 64.74 | 68 |
| 1987 | 64.82 | 70 |
| 1986 | 64.9 | 69 |