| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.64 | 104 |
| 2015 | 5.48 | 104 |
| 2014 | 5.31 | 104 |
| 2013 | 5.18 | 105 |
| 2012 | 5.08 | 105 |
| 2011 | 4.99 | 106 |
| 2010 | 4.9 | 108 |
| 2009 | 4.78 | 109 |
| 2008 | 4.66 | 112 |
| 2007 | 4.54 | 112 |
| 2006 | 4.42 | 114 |
| 2005 | 4.31 | 116 |
| 2004 | 4.18 | 120 |
| 2003 | 4.06 | 123 |
| 2002 | 3.95 | 122 |
| 2001 | 3.86 | 122 |
| 2000 | 3.77 | 124 |
| 1999 | 3.74 | 125 |
| 1998 | 3.72 | 126 |
| 1997 | 3.7 | 125 |
| 1996 | 3.67 | 126 |
| 1995 | 3.63 | 126 |
| 1994 | 3.62 | 126 |
| 1993 | 3.61 | 124 |
| 1992 | 3.59 | 125 |
| 1991 | 3.56 | 126 |
| 1990 | 3.53 | 128 |
| 1989 | 3.51 | 127 |
| 1988 | 3.49 | 127 |
| 1987 | 3.47 | 127 |
| 1986 | 3.43 | 129 |