| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 60.35 | 51 |
| 2015 | 61.39 | 48 |
| 2014 | 62.45 | 48 |
| 2013 | 63.53 | 48 |
| 2012 | 64.63 | 44 |
| 2011 | 65.75 | 45 |
| 2010 | 66.88 | 44 |
| 2009 | 68.02 | 42 |
| 2008 | 69.16 | 40 |
| 2007 | 70.31 | 35 |
| 2006 | 71.46 | 34 |
| 2005 | 72.61 | 32 |
| 2004 | 73.76 | 30 |
| 2003 | 74.87 | 27 |
| 2002 | 75.96 | 27 |
| 2001 | 77.01 | 26 |
| 2000 | 78.02 | 23 |
| 1999 | 79.01 | 20 |
| 1998 | 79.96 | 19 |
| 1997 | 80.88 | 19 |
| 1996 | 81.77 | 17 |
| 1995 | 82.62 | 17 |
| 1994 | 83.15 | 16 |
| 1993 | 83.51 | 15 |
| 1992 | 83.87 | 15 |
| 1991 | 84.22 | 14 |
| 1990 | 84.56 | 14 |
| 1989 | 84.9 | 13 |
| 1988 | 85.23 | 13 |
| 1987 | 85.56 | 14 |
| 1986 | 85.88 | 13 |