| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 14.03 | 127 |
| 2015 | 13.32 | 124 |
| 2014 | 12.75 | 123 |
| 2013 | 12.3 | 123 |
| 2012 | 11.95 | 122 |
| 2011 | 11.66 | 125 |
| 2010 | 11.39 | 125 |
| 2009 | 11.17 | 124 |
| 2008 | 11 | 124 |
| 2007 | 10.86 | 124 |
| 2006 | 10.74 | 121 |
| 2005 | 10.63 | 122 |
| 2004 | 10.54 | 122 |
| 2003 | 10.45 | 124 |
| 2002 | 10.35 | 123 |
| 2001 | 10.23 | 121 |
| 2000 | 10.09 | 121 |
| 1999 | 9.97 | 121 |
| 1998 | 9.81 | 122 |
| 1997 | 9.64 | 121 |
| 1996 | 9.46 | 121 |
| 1995 | 9.28 | 119 |
| 1994 | 9.12 | 118 |
| 1993 | 8.98 | 118 |
| 1992 | 8.85 | 119 |
| 1991 | 8.73 | 120 |
| 1990 | 8.62 | 119 |
| 1989 | 8.54 | 119 |
| 1988 | 8.49 | 120 |
| 1987 | 8.45 | 121 |
| 1986 | 8.4 | 121 |