| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.38 | 81 |
| 2015 | 2.42 | 80 |
| 2014 | 2.48 | 76 |
| 2013 | 2.62 | 71 |
| 2012 | 2.69 | 73 |
| 2011 | 2.73 | 73 |
| 2010 | 2.74 | 75 |
| 2009 | 2.87 | 71 |
| 2008 | 2.9 | 72 |
| 2007 | 3.03 | 70 |
| 2006 | 3.14 | 68 |
| 2005 | 3.41 | 56 |
| 2004 | 3.4 | 57 |
| 2003 | 3.1 | 65 |
| 2002 | 2.17 | 98 |
| 2001 | 1.85 | 114 |
| 2000 | 1.7 | 116 |
| 1999 | 1.32 | 132 |
| 1998 | 1.22 | 137 |
| 1997 | 1.14 | 140 |
| 1996 | 1.22 | 143 |
| 1995 | 1.36 | 133 |
| 1994 | 1.31 | 134 |
| 1993 | 1.45 | 132 |
| 1992 | 2.42 | 103 |
| 1991 | 3.75 | 67 |
| 1990 | 3.93 | 62 |
| 1989 | 4.06 | 64 |
| 1988 | 4.17 | 68 |
| 1987 | 4.32 | 64 |
| 1986 | 4.68 | 56 |