| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 60.62 | 49 |
| 2015 | 61.36 | 49 |
| 2014 | 62.1 | 49 |
| 2013 | 62.86 | 49 |
| 2012 | 63.63 | 49 |
| 2011 | 64.42 | 48 |
| 2010 | 65.21 | 46 |
| 2009 | 65.99 | 46 |
| 2008 | 66.76 | 45 |
| 2007 | 67.53 | 43 |
| 2006 | 68.29 | 42 |
| 2005 | 69.04 | 42 |
| 2004 | 70.17 | 40 |
| 2003 | 71.31 | 39 |
| 2002 | 72.43 | 34 |
| 2001 | 73.52 | 32 |
| 2000 | 74.58 | 31 |
| 1999 | 75.62 | 31 |
| 1998 | 76.62 | 30 |
| 1997 | 77.6 | 25 |
| 1996 | 78.54 | 23 |
| 1995 | 79.46 | 22 |
| 1994 | 80.35 | 21 |
| 1993 | 81.21 | 20 |
| 1992 | 82.04 | 19 |
| 1991 | 82.84 | 19 |
| 1990 | 83.61 | 17 |
| 1989 | 84.36 | 16 |
| 1988 | 85.07 | 15 |
| 1987 | 85.76 | 12 |
| 1986 | 86.42 | 12 |