| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.72 | 48 |
| 2015 | 1.44 | 135 |
| 2014 | -.04 | 178 |
| 2013 | 1.12 | 144 |
| 2012 | 1.23 | 153 |
| 2011 | 1.54 | 143 |
| 2010 | 1.47 | 138 |
| 2009 | 0.68 | 159 |
| 2008 | 2.33 | 135 |
| 2007 | 3.15 | 128 |
| 2006 | 3.4 | 113 |
| 2005 | 3.87 | 83 |
| 2004 | 1.68 | 124 |
| 2003 | 2.29 | 99 |
| 2002 | 3.43 | 72 |
| 2001 | 3.63 | 64 |
| 2000 | 3.02 | 91 |
| 1999 | 3.07 | 79 |
| 1998 | 1.95 | 104 |
| 1997 | 1.58 | 107 |
| 1996 | 1.36 | 88 |
| 1995 | 1.47 | 81 |
| 1994 | 1.13 | 82 |
| 1993 | 1.56 | 60 |
| 1992 | 1.55 | 51 |
| 1991 | 1.19 | 59 |
| 1990 | 1.03 | 63 |
| 1989 | 1 | 56 |
| 1988 | 0.83 | 55 |
| 1987 | 0.55 | 73 |
| 1986 | 0.42 | 75 |