| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.3 | 129 |
| 2015 | 1.19 | 132 |
| 2014 | 1.3 | 123 |
| 2013 | 1.62 | 111 |
| 2012 | 2.45 | 79 |
| 2011 | 2.08 | 94 |
| 2010 | 1.77 | 103 |
| 2009 | 3.02 | 66 |
| 2008 | 5.32 | 14 |
| 2007 | 4.17 | 31 |
| 2006 | 3.13 | 69 |
| 2005 | 2.35 | 86 |
| 2004 | 1.25 | 134 |
| 2003 | -1.47 | 210 |
| 2002 | 0.91 | 152 |
| 2001 | 2.7 | 79 |
| 2000 | 1.73 | 113 |
| 1999 | 0.8 | 150 |
| 1998 | 3.4 | 57 |
| 1997 | 3.36 | 62 |
| 1996 | 4.06 | 42 |
| 1995 | 3.04 | 72 |
| 1994 | 3.14 | 72 |
| 1993 | 2.53 | 96 |
| 1992 | 3 | 82 |
| 1991 | 2.85 | 91 |
| 1990 | 3.89 | 64 |
| 1989 | 2.94 | 97 |
| 1988 | 2.54 | 111 |
| 1987 | 1.5 | 152 |
| 1986 | -.09 | 202 |