| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 93.34 | 22 |
| 2015 | 95.62 | 22 |
| 2014 | 84.52 | 28 |
| 2013 | 78.66 | 32 |
| 2012 | 75.39 | 35 |
| 2011 | 71.11 | 41 |
| 2010 | 69.72 | 46 |
| 2009 | 70.11 | 49 |
| 2008 | 64.21 | 50 |
| 2007 | 60.33 | 55 |
| 2006 | 53.36 | 63 |
| 2005 | 51.53 | 62 |
| 2004 | 50.07 | 62 |
| 2003 | 59.35 | 47 |
| 2002 | 56.74 | 51 |
| 2001 | 63.48 | 40 |
| 2000 | 52.18 | 47 |
| 1999 | 55.4 | 44 |
| 1998 | 55.2 | 44 |
| 1997 | 54.72 | 42 |
| 1996 | 51.03 | 47 |
| 1995 | 42.49 | 59 |
| 1994 | 46.04 | 54 |
| 1993 | 41.88 | 62 |
| 1992 | 34.8 | 71 |
| 1991 | 29.78 | 81 |
| 1990 | 24.47 | 87 |
| 1989 | 19.48 | 103 |
| 1988 | 18.84 | 105 |
| 1987 | 17.83 | 106 |
| 1986 | 10.74 | 115 |