| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.42 | 72 |
| 2015 | 1.46 | 74 |
| 2014 | 1.28 | 91 |
| 2013 | 1.18 | 100 |
| 2012 | 1.18 | 98 |
| 2011 | 1.26 | 89 |
| 2010 | 1.38 | 85 |
| 2009 | 1.53 | 77 |
| 2008 | 1.59 | 74 |
| 2007 | 1.43 | 87 |
| 2006 | 1.31 | 101 |
| 2005 | 2.24 | 48 |
| 2004 | 2.82 | 33 |
| 2003 | 2.2 | 58 |
| 2002 | 2.3 | 52 |
| 2001 | 2.06 | 59 |
| 2000 | 1.77 | 69 |
| 1996 | 0.79 | 129 |
| 1995 | 0.92 | 123 |
| 1994 | 1.01 | 118 |
| 1993 | 0.98 | 123 |
| 1992 | 0.98 | 114 |
| 1991 | 0.6 | 114 |
| 1990 | 0.91 | 108 |
| 1989 | 1.58 | 85 |
| 1988 | 2.66 | 50 |
| 1987 | 2.98 | 48 |
| 1986 | 5.48 | 15 |