| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.08 | 113 |
| 2015 | 5.04 | 111 |
| 2014 | 5.01 | 109 |
| 2013 | 4.95 | 109 |
| 2012 | 4.88 | 111 |
| 2011 | 4.79 | 112 |
| 2010 | 4.69 | 113 |
| 2009 | 4.63 | 115 |
| 2008 | 4.55 | 115 |
| 2007 | 4.46 | 116 |
| 2006 | 4.37 | 117 |
| 2005 | 4.26 | 119 |
| 2004 | 4.18 | 121 |
| 2003 | 4.09 | 121 |
| 2002 | 4.01 | 121 |
| 2001 | 3.92 | 121 |
| 2000 | 3.83 | 123 |
| 1999 | 3.74 | 127 |
| 1998 | 3.65 | 129 |
| 1997 | 3.56 | 131 |
| 1996 | 3.47 | 137 |
| 1995 | 3.37 | 140 |
| 1994 | 3.32 | 140 |
| 1993 | 3.28 | 140 |
| 1992 | 3.23 | 140 |
| 1991 | 3.18 | 141 |
| 1990 | 3.12 | 146 |
| 1989 | 3.1 | 147 |
| 1988 | 3.08 | 147 |
| 1987 | 3.06 | 148 |
| 1986 | 3.03 | 147 |