| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 13.07 | 102 |
| 2014 | 14.62 | 106 |
| 2013 | 15.26 | 110 |
| 2012 | 14.19 | 120 |
| 2011 | 14.44 | 119 |
| 2010 | 12.87 | 124 |
| 2009 | 13.73 | 117 |
| 2008 | 17.88 | 96 |
| 2007 | 15.34 | 110 |
| 2006 | 13.94 | 116 |
| 2005 | 14.67 | 106 |
| 2004 | 16.49 | 89 |
| 2003 | 13.71 | 102 |
| 2002 | 21.33 | 59 |
| 2001 | 21.66 | 58 |
| 2000 | 18.52 | 64 |
| 1999 | 11.1 | 111 |
| 1998 | 14.02 | 87 |
| 1997 | 14.19 | 80 |
| 1996 | 15.81 | 72 |
| 1995 | 9.2 | 112 |
| 1994 | 8.94 | 107 |
| 1993 | 8.37 | 112 |
| 1992 | 11.54 | 84 |
| 1991 | 12.29 | 74 |
| 1990 | 12.8 | 71 |
| 1989 | 13.54 | 65 |
| 1988 | 10.89 | 73 |
| 1987 | 11.9 | 64 |
| 1986 | 13.29 | 59 |