| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.19 | 100 |
| 2015 | 2.53 | 83 |
| 2014 | 2.5 | 93 |
| 2013 | 2.68 | 93 |
| 2012 | 3.62 | 68 |
| 2011 | 1.96 | 120 |
| 2010 | 0.23 | 104 |
| 2009 | 3.5 | 67 |
| 2008 | 1.81 | 112 |
| 2007 | 3.42 | 77 |
| 2006 | 6.3 | 33 |
| 2005 | 6.48 | 42 |
| 2004 | 2.43 | 103 |
| 2003 | 4.15 | 60 |
| 2002 | 0.1 | 110 |
| 2001 | -2.18 | 125 |
| 2000 | 6.09 | 43 |
| 1999 | 1.95 | 100 |
| 1998 | 4.52 | 47 |
| 1997 | 0.12 | 105 |
| 1996 | 11.72 | 20 |
| 1995 | 6.57 | 34 |
| 1994 | 5.23 | 36 |
| 1993 | -5.29 | 107 |
| 1992 | 9.5 | 20 |
| 1991 | 4.96 | 34 |
| 1990 | 3.03 | 55 |
| 1989 | 6.87 | 22 |
| 1988 | 2.73 | 63 |
| 1987 | 3.25 | 46 |
| 1986 | 5.95 | 28 |