| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.69 | 116 |
| 2015 | 4.57 | 116 |
| 2014 | 4.48 | 119 |
| 2013 | 4.39 | 120 |
| 2012 | 4.3 | 124 |
| 2011 | 4.21 | 125 |
| 2010 | 4.14 | 126 |
| 2009 | 3.99 | 127 |
| 2008 | 3.86 | 129 |
| 2007 | 3.73 | 132 |
| 2006 | 3.6 | 133 |
| 2005 | 3.48 | 134 |
| 2004 | 3.43 | 137 |
| 2003 | 3.39 | 139 |
| 2002 | 3.35 | 141 |
| 2001 | 3.31 | 144 |
| 2000 | 3.26 | 146 |
| 1999 | 3.22 | 146 |
| 1998 | 3.19 | 146 |
| 1997 | 3.15 | 147 |
| 1996 | 3.12 | 147 |
| 1995 | 3.08 | 148 |
| 1994 | 3.09 | 147 |
| 1993 | 3.1 | 148 |
| 1992 | 3.12 | 147 |
| 1991 | 3.13 | 146 |
| 1990 | 3.14 | 145 |
| 1989 | 3.16 | 142 |
| 1988 | 3.17 | 142 |
| 1987 | 3.17 | 140 |
| 1986 | 3.17 | 140 |