| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 10.03 | 59 |
| 2015 | 9 | 76 |
| 2014 | 11.88 | 57 |
| 2013 | 12.78 | 63 |
| 2012 | 14.95 | 48 |
| 2011 | 16.43 | 49 |
| 2010 | 15.4 | 62 |
| 2009 | 12.95 | 71 |
| 2008 | 14.92 | 78 |
| 2007 | 19.33 | 72 |
| 2006 | 14.94 | 104 |
| 2005 | 16.34 | 73 |
| 2004 | 9.14 | 114 |
| 2003 | 7.94 | 113 |
| 2002 | 4.76 | 125 |
| 2001 | 11.87 | 90 |
| 2000 | 16.62 | 64 |
| 1999 | 12.23 | 90 |
| 1998 | 62.76 | 6 |
| 1997 | 25.25 | 42 |
| 1996 | 27.08 | 37 |
| 1995 | 27.52 | 46 |
| 1994 | 20.2 | 72 |
| 1993 | 20.06 | 61 |
| 1992 | 19.62 | 56 |
| 1991 | 17.53 | 64 |
| 1990 | 44.56 | 21 |
| 1989 | 38.17 | 22 |
| 1988 | 24.32 | 38 |
| 1987 | 22.79 | 40 |
| 1986 | 19.48 | 45 |