| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.17 | 111 |
| 2015 | 5.03 | 113 |
| 2014 | 4.93 | 113 |
| 2013 | 4.82 | 113 |
| 2012 | 4.71 | 115 |
| 2011 | 4.62 | 115 |
| 2010 | 4.56 | 115 |
| 2009 | 4.45 | 118 |
| 2008 | 4.37 | 120 |
| 2007 | 4.32 | 122 |
| 2006 | 4.25 | 123 |
| 2005 | 4.16 | 123 |
| 2004 | 4.17 | 122 |
| 2003 | 4.16 | 118 |
| 2002 | 4.12 | 118 |
| 2001 | 4.07 | 117 |
| 2000 | 4.03 | 116 |
| 1999 | 4.02 | 116 |
| 1998 | 4 | 116 |
| 1997 | 3.97 | 114 |
| 1996 | 3.93 | 115 |
| 1995 | 3.87 | 116 |
| 1994 | 3.91 | 115 |
| 1993 | 3.95 | 115 |
| 1992 | 3.98 | 112 |
| 1991 | 3.98 | 111 |
| 1990 | 3.94 | 109 |
| 1989 | 3.86 | 109 |
| 1988 | 3.83 | 111 |
| 1987 | 3.88 | 110 |
| 1986 | 3.99 | 100 |