| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.65 | 113 |
| 2015 | 1.63 | 113 |
| 2014 | 1.61 | 111 |
| 2013 | 1.64 | 110 |
| 2012 | 1.72 | 108 |
| 2011 | 1.67 | 109 |
| 2010 | 1.77 | 102 |
| 2009 | 1.83 | 105 |
| 2008 | 1.95 | 106 |
| 2007 | 2.05 | 97 |
| 2006 | 2.22 | 90 |
| 2005 | 2.36 | 85 |
| 2004 | 2.51 | 80 |
| 2003 | 2.73 | 75 |
| 2002 | 3.1 | 66 |
| 2001 | 3.54 | 55 |
| 2000 | 1.68 | 118 |
| 1999 | 1.28 | 137 |
| 1998 | 1.58 | 119 |
| 1997 | 1.81 | 112 |
| 1996 | 2.13 | 103 |
| 1995 | 3.13 | 68 |
| 1994 | 3.32 | 63 |
| 1993 | 3.3 | 68 |
| 1992 | 3.2 | 78 |
| 1991 | 3.07 | 81 |
| 1990 | 2.72 | 95 |
| 1989 | 2.34 | 117 |
| 1988 | 2.25 | 124 |
| 1987 | 2.32 | 123 |
| 1986 | 3.28 | 92 |