| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.21 | 109 |
| 2015 | 5.08 | 109 |
| 2014 | 4.98 | 110 |
| 2013 | 4.9 | 111 |
| 2012 | 4.83 | 113 |
| 2011 | 4.76 | 114 |
| 2010 | 4.68 | 114 |
| 2009 | 4.63 | 114 |
| 2008 | 4.57 | 114 |
| 2007 | 4.5 | 113 |
| 2006 | 4.42 | 115 |
| 2005 | 4.34 | 115 |
| 2004 | 4.28 | 115 |
| 2003 | 4.23 | 115 |
| 2002 | 4.17 | 114 |
| 2001 | 4.1 | 116 |
| 2000 | 4.02 | 117 |
| 1999 | 3.98 | 118 |
| 1998 | 3.93 | 118 |
| 1997 | 3.87 | 119 |
| 1996 | 3.81 | 121 |
| 1995 | 3.74 | 121 |
| 1994 | 3.68 | 123 |
| 1993 | 3.62 | 123 |
| 1992 | 3.56 | 126 |
| 1991 | 3.51 | 129 |
| 1990 | 3.46 | 130 |
| 1989 | 3.46 | 129 |
| 1988 | 3.47 | 129 |
| 1987 | 3.47 | 126 |
| 1986 | 3.46 | 126 |