| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.03 | 71 |
| 2015 | 1.06 | 70 |
| 2014 | 1.07 | 70 |
| 2013 | 1.09 | 69 |
| 2012 | 1.1 | 69 |
| 2011 | 1.1 | 69 |
| 2010 | 1.1 | 75 |
| 2009 | 1.13 | 76 |
| 2008 | 1.15 | 78 |
| 2007 | 1.16 | 74 |
| 2006 | 1.17 | 77 |
| 2005 | 1.18 | 72 |
| 2004 | 1.18 | 72 |
| 2003 | 1.19 | 73 |
| 2002 | 1.21 | 75 |
| 2001 | 1.23 | 76 |
| 2000 | 1.68 | 51 |
| 1999 | 1.69 | 57 |
| 1998 | 1.7 | 56 |
| 1997 | 1.71 | 58 |
| 1996 | 1.72 | 59 |
| 1995 | 1.73 | 57 |
| 1994 | 1.75 | 59 |
| 1993 | 1.77 | 58 |
| 1992 | 1.8 | 58 |
| 1991 | 1.84 | 58 |
| 1990 | 1.39 | 73 |
| 1989 | 1.46 | 81 |
| 1988 | 1.51 | 77 |
| 1987 | 1.54 | 78 |
| 1986 | 1.55 | 73 |