| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 13.34 | 122 |
| 2015 | 12.94 | 122 |
| 2014 | 12.52 | 122 |
| 2013 | 12.1 | 121 |
| 2012 | 11.69 | 120 |
| 2011 | 11.31 | 121 |
| 2010 | 10.97 | 121 |
| 2009 | 10.67 | 119 |
| 2008 | 10.41 | 115 |
| 2007 | 10.19 | 114 |
| 2006 | 9.99 | 113 |
| 2005 | 9.79 | 110 |
| 2004 | 9.6 | 110 |
| 2003 | 9.43 | 109 |
| 2002 | 9.26 | 108 |
| 2001 | 9.11 | 108 |
| 2000 | 8.96 | 108 |
| 1999 | 8.85 | 109 |
| 1998 | 8.74 | 109 |
| 1997 | 8.63 | 109 |
| 1996 | 8.53 | 109 |
| 1995 | 8.42 | 110 |
| 1994 | 8.3 | 110 |
| 1993 | 8.18 | 110 |
| 1992 | 8.06 | 109 |
| 1991 | 7.93 | 111 |
| 1990 | 7.81 | 109 |
| 1989 | 7.66 | 105 |
| 1988 | 7.52 | 99 |
| 1987 | 7.39 | 97 |
| 1986 | 7.27 | 92 |