| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 86.23 | 27 |
| 2015 | 93.34 | 24 |
| 2014 | 93.83 | 20 |
| 2013 | 98.62 | 18 |
| 2012 | 95.7 | 20 |
| 2011 | 99.34 | 20 |
| 2010 | 97.39 | 22 |
| 2009 | 91.58 | 26 |
| 2008 | 90.92 | 26 |
| 2007 | 91.89 | 24 |
| 2006 | 93.53 | 23 |
| 2005 | 94.88 | 24 |
| 2004 | 96.83 | 22 |
| 2003 | 98.05 | 17 |
| 2002 | 89.07 | 23 |
| 2001 | 86.01 | 23 |
| 2000 | 79.04 | 20 |
| 1999 | 80.29 | 20 |
| 1998 | 67.71 | 28 |
| 1997 | 63.07 | 32 |
| 1996 | 63.22 | 33 |
| 1995 | 70.89 | 22 |
| 1994 | 58 | 34 |
| 1993 | 58.66 | 36 |
| 1992 | 58.64 | 30 |
| 1991 | 55.21 | 33 |
| 1990 | 50.17 | 42 |
| 1989 | 50.69 | 41 |
| 1988 | 49.23 | 40 |
| 1987 | 49.37 | 35 |
| 1986 | 41.99 | 46 |