| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.81 | 51 |
| 2015 | 1.78 | 57 |
| 2014 | 1.81 | 58 |
| 2013 | 1.88 | 53 |
| 2012 | 1.89 | 52 |
| 2011 | 2.21 | 40 |
| 2010 | 2.3 | 44 |
| 2009 | 2.12 | 49 |
| 2008 | 2.02 | 51 |
| 2007 | 1.78 | 63 |
| 2006 | 1.78 | 65 |
| 2005 | 1.87 | 66 |
| 2004 | 1.54 | 85 |
| 2003 | 1.45 | 95 |
| 2002 | 1.28 | 106 |
| 2001 | 1.27 | 107 |
| 2000 | 1.41 | 91 |
| 1999 | 1.67 | 71 |
| 1998 | 1.63 | 79 |
| 1997 | 1.49 | 92 |
| 1996 | 1.65 | 79 |
| 1995 | 1.69 | 80 |
| 1994 | 1.82 | 81 |
| 1993 | 1.75 | 95 |
| 1992 | 1.63 | 94 |
| 1991 | 1.38 | 95 |
| 1990 | 1.28 | 98 |
| 1989 | 1.25 | 97 |
| 1988 | 1.26 | 98 |
| 1987 | 1.43 | 92 |
| 1986 | 1.63 | 82 |