| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.13 | 96 |
| 2015 | 1.11 | 103 |
| 2014 | 1.13 | 100 |
| 2013 | 1.12 | 105 |
| 2012 | 1.19 | 97 |
| 2011 | 1.23 | 91 |
| 2010 | 1.32 | 92 |
| 2009 | 1.34 | 96 |
| 2008 | 1.25 | 104 |
| 2007 | 1.25 | 103 |
| 2006 | 1.31 | 102 |
| 2005 | 1.21 | 111 |
| 2004 | 1.25 | 111 |
| 2003 | 1.35 | 104 |
| 2002 | 1.38 | 98 |
| 2001 | 1.47 | 88 |
| 2000 | 1.58 | 78 |
| 1999 | 1.62 | 76 |
| 1998 | 1.7 | 75 |
| 1997 | 1.7 | 75 |
| 1996 | 1.78 | 70 |
| 1995 | 1.82 | 73 |
| 1994 | 1.82 | 80 |
| 1993 | 1.9 | 83 |
| 1992 | 2.07 | 74 |
| 1991 | 2.26 | 65 |
| 1990 | 2.33 | 66 |
| 1989 | 2.16 | 70 |
| 1988 | 2.09 | 78 |
| 1987 | 2.4 | 62 |
| 1986 | 2.28 | 65 |