| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.28 | 81 |
| 2015 | 1.14 | 97 |
| 2014 | 1.09 | 103 |
| 2013 | 1.24 | 95 |
| 2012 | 1.16 | 100 |
| 2011 | 1.21 | 93 |
| 2010 | 1.22 | 98 |
| 2009 | 1.26 | 102 |
| 2008 | 1.3 | 98 |
| 2007 | 1.35 | 92 |
| 2006 | 1.32 | 100 |
| 2005 | 1.33 | 107 |
| 2004 | 1.36 | 101 |
| 2003 | 1.55 | 86 |
| 2002 | 1.47 | 90 |
| 2001 | 1.47 | 89 |
| 2000 | 1.61 | 77 |
| 1999 | 1.62 | 77 |
| 1998 | 1.7 | 74 |
| 1997 | 1.91 | 69 |
| 1996 | 2.27 | 53 |
| 1995 | 2.29 | 55 |
| 1994 | 2.17 | 65 |
| 1993 | 2.16 | 69 |
| 1992 | 2.04 | 75 |
| 1991 | 2.01 | 78 |
| 1990 | 2.15 | 73 |
| 1989 | 2.24 | 67 |
| 1988 | 2.46 | 55 |
| 1987 | 1.97 | 79 |
| 1986 | 1.99 | 72 |