| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 9.16 | 68 |
| 2015 | 6.04 | 98 |
| 2014 | 9.62 | 75 |
| 2013 | 6.39 | 115 |
| 2012 | -1.64 | 147 |
| 2011 | -6.13 | 155 |
| 2010 | 6.41 | 123 |
| 2009 | 8.92 | 89 |
| 2008 | 7.37 | 130 |
| 2007 | 11.01 | 130 |
| 2006 | 13.75 | 112 |
| 2005 | 15.65 | 79 |
| 2004 | 8.32 | 119 |
| 2003 | 13.96 | 76 |
| 2002 | 10.21 | 92 |
| 2001 | 6.1 | 123 |
| 2000 | 16.33 | 66 |
| 1999 | 15.73 | 63 |
| 1998 | 2.48 | 128 |
| 1997 | 15.15 | 86 |
| 1996 | 6.28 | 126 |
| 1995 | 24.36 | 49 |
| 1994 | 13.85 | 89 |
| 1993 | 1.44 | 123 |
| 1992 | 0.72 | 119 |
| 1991 | -1.88 | 123 |
| 1990 | 19.25 | 52 |
| 1989 | 16.72 | 60 |
| 1988 | 7.77 | 91 |
| 1987 | 27.71 | 34 |
| 1986 | 20.52 | 42 |