| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.16 | 90 |
| 2015 | 2.23 | 91 |
| 2014 | 2.29 | 86 |
| 2013 | 2.32 | 86 |
| 2012 | 2.3 | 87 |
| 2011 | 2.25 | 88 |
| 2010 | 2.19 | 92 |
| 2009 | 2.13 | 94 |
| 2008 | 2.09 | 96 |
| 2007 | 2.07 | 96 |
| 2006 | 2.06 | 101 |
| 2005 | 2 | 101 |
| 2004 | 1.72 | 116 |
| 2003 | 1.72 | 118 |
| 2002 | 1.74 | 117 |
| 2001 | 1.76 | 118 |
| 2000 | 1.78 | 110 |
| 1999 | 1.82 | 106 |
| 1998 | 1.87 | 106 |
| 1997 | 1.95 | 109 |
| 1996 | 2.05 | 108 |
| 1995 | 2.29 | 100 |
| 1994 | 3.05 | 77 |
| 1993 | 3.16 | 77 |
| 1992 | 3.25 | 76 |
| 1991 | 3.31 | 79 |
| 1990 | 3.37 | 81 |
| 1989 | 3.43 | 84 |
| 1988 | 3.51 | 87 |
| 1987 | 3.61 | 89 |
| 1986 | 3.73 | 84 |