| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.94 | 74 |
| 2015 | 3.71 | 33 |
| 2014 | 1.37 | 86 |
| 2013 | -.6 | 126 |
| 2012 | -1.46 | 132 |
| 2011 | -1.29 | 135 |
| 2010 | -.37 | 130 |
| 2009 | -6.75 | 141 |
| 2008 | -2.01 | 133 |
| 2007 | 3.58 | 77 |
| 2006 | 3.85 | 63 |
| 2005 | 4.75 | 57 |
| 2004 | 1.75 | 102 |
| 2003 | 1.22 | 96 |
| 2002 | 1.99 | 72 |
| 2001 | 2.98 | 48 |
| 2000 | 9.1 | 11 |
| 1999 | 8.21 | 8 |
| 1998 | 6.69 | 21 |
| 1997 | 5.4 | 30 |
| 1996 | 6.62 | 29 |
| 1995 | 2.92 | 50 |
| 1994 | 3.95 | 34 |
| 1993 | 2.39 | 40 |
| 1992 | 2.19 | 40 |
| 1991 | 1.22 | 57 |
| 1990 | 1.33 | 44 |
| 1989 | 6.94 | 14 |
| 1988 | 4.93 | 27 |
| 1987 | 3.31 | 31 |
| 1986 | 1.97 | 48 |