| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.04 | 97 |
| 2015 | 2.05 | 95 |
| 2014 | 1.99 | 95 |
| 2013 | 1.93 | 95 |
| 2012 | 1.91 | 95 |
| 2011 | 1.92 | 98 |
| 2010 | 1.89 | 100 |
| 2009 | 2.46 | 78 |
| 2008 | 1.84 | 110 |
| 2007 | 1.84 | 106 |
| 2006 | 1.84 | 112 |
| 2005 | 1.83 | 109 |
| 2004 | 1.84 | 105 |
| 2003 | 1.87 | 108 |
| 2002 | 2.08 | 103 |
| 2001 | 2.43 | 91 |
| 2000 | 2.71 | 75 |
| 1999 | 2.62 | 79 |
| 1998 | 2.36 | 93 |
| 1997 | 2.57 | 85 |
| 1996 | 2.7 | 82 |
| 1995 | 2.78 | 80 |
| 1994 | 2.7 | 87 |
| 1993 | 2.77 | 84 |
| 1992 | 3.57 | 67 |
| 1991 | 6.13 | 12 |
| 1990 | 3.21 | 87 |
| 1989 | 1.81 | 137 |
| 1988 | 1.77 | 144 |
| 1987 | 1.74 | 145 |
| 1986 | 1.67 | 143 |