| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.34 | 46 |
| 2015 | 5.24 | 49 |
| 2014 | 6.14 | 46 |
| 2013 | 3.59 | 81 |
| 2012 | 4.94 | 50 |
| 2011 | 2.37 | 121 |
| 2010 | 4.86 | 89 |
| 2009 | -6.67 | 121 |
| 2008 | -.87 | 135 |
| 2007 | 0.79 | 132 |
| 2006 | 4.31 | 102 |
| 2005 | 3.13 | 104 |
| 2004 | 6.98 | 63 |
| 2003 | 7.39 | 52 |
| 2002 | 4.19 | 77 |
| 2001 | -2.5 | 137 |
| 2000 | 10.74 | 28 |
| 1999 | 8.24 | 30 |
| 1998 | -9.31 | 155 |
| 1997 | 6.77 | 46 |
| 1996 | 12.19 | 15 |
| 1995 | 16.52 | 9 |
| 1994 | 9.97 | 21 |
| 1993 | 7.56 | 26 |
| 1992 | 6.77 | 40 |
| 1991 | 9.73 | 20 |
| 1990 | 8.37 | 23 |
| 1989 | 2.51 | 73 |
| 1988 | 12.1 | 18 |
| 1987 | 3.92 | 57 |
| 1986 | 4.55 | 50 |