| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.15 | 93 |
| 2015 | 1.12 | 101 |
| 2014 | 1.15 | 96 |
| 2013 | 1.23 | 96 |
| 2012 | 1.35 | 83 |
| 2011 | 1.31 | 80 |
| 2010 | 1.4 | 80 |
| 2009 | 1.35 | 94 |
| 2008 | 1.36 | 96 |
| 2007 | 1.31 | 97 |
| 2006 | 1.38 | 95 |
| 2005 | 1.31 | 109 |
| 2004 | 1.42 | 94 |
| 2003 | 1.47 | 93 |
| 2002 | 1.51 | 88 |
| 2001 | 1.53 | 82 |
| 2000 | 1.46 | 86 |
| 1999 | 1.56 | 81 |
| 1998 | 1.61 | 80 |
| 1997 | 1.62 | 80 |
| 1996 | 1.64 | 80 |
| 1995 | 1.69 | 81 |
| 1994 | 1.74 | 87 |
| 1993 | 1.87 | 86 |
| 1992 | 1.86 | 84 |
| 1991 | 1.92 | 84 |
| 1990 | 1.92 | 84 |
| 1989 | 1.94 | 77 |
| 1988 | 2.01 | 80 |
| 1987 | 1.96 | 80 |
| 1986 | 1.87 | 75 |