| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.94 | 165 |
| 2015 | 3 | 163 |
| 2014 | 3.11 | 155 |
| 2013 | 3.23 | 152 |
| 2012 | 3.36 | 147 |
| 2011 | 3.5 | 141 |
| 2010 | 3.63 | 137 |
| 2009 | 3.79 | 131 |
| 2008 | 3.96 | 126 |
| 2007 | 4.12 | 124 |
| 2006 | 4.26 | 121 |
| 2005 | 4.38 | 114 |
| 2004 | 4.48 | 113 |
| 2003 | 4.55 | 113 |
| 2002 | 4.59 | 105 |
| 2001 | 4.62 | 104 |
| 2000 | 4.64 | 103 |
| 1999 | 4.65 | 102 |
| 1998 | 4.66 | 101 |
| 1997 | 4.67 | 100 |
| 1996 | 4.67 | 97 |
| 1995 | 4.66 | 93 |
| 1994 | 4.68 | 91 |
| 1993 | 4.69 | 88 |
| 1992 | 4.69 | 87 |
| 1991 | 4.69 | 85 |
| 1990 | 4.69 | 83 |
| 1989 | 4.7 | 78 |
| 1988 | 4.71 | 77 |
| 1987 | 4.71 | 77 |
| 1986 | 4.7 | 75 |