| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2013 | 1.43 | 76 |
| 2012 | 1.3 | 89 |
| 2011 | 0.75 | 124 |
| 2010 | 0.85 | 122 |
| 2009 | 1.22 | 104 |
| 2008 | 1.37 | 93 |
| 2007 | 1.29 | 99 |
| 2006 | 1.63 | 75 |
| 2005 | 1.41 | 97 |
| 2004 | 1.29 | 110 |
| 2003 | 1.18 | 114 |
| 2002 | 1.15 | 112 |
| 2001 | 1.56 | 81 |
| 2000 | 1.53 | 82 |
| 1999 | 1.44 | 88 |
| 1998 | 1.59 | 82 |
| 1997 | 1.8 | 71 |
| 1996 | 1.07 | 113 |
| 1995 | 1.6 | 87 |
| 1994 | 1.64 | 93 |
| 1993 | 2.22 | 64 |
| 1992 | 1.7 | 90 |
| 1991 | 1.9 | 85 |
| 1990 | 1.57 | 89 |
| 1989 | 2.84 | 49 |
| 1988 | 1.88 | 83 |
| 1987 | 1.69 | 86 |
| 1986 | 1.71 | 78 |