| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 10.4 | 9 |
| 2015 | 6.66 | 33 |
| 2014 | 6.69 | 27 |
| 2013 | 4.3 | 56 |
| 2012 | 3.32 | 73 |
| 2011 | 3.35 | 64 |
| 2010 | 7.69 | 27 |
| 2009 | -.26 | 134 |
| 2008 | 10.56 | 24 |
| 2007 | -5.93 | 144 |
| 2006 | -.52 | 133 |
| 2005 | 6.86 | 42 |
| 2004 | 3.16 | 75 |
| 2003 | 5.63 | 40 |
| 2002 | -4.6 | 133 |
| 2001 | -2.9 | 129 |
| 2000 | 4.81 | 40 |
| 1999 | 8.19 | 22 |
| 1998 | 4.38 | 40 |
| 1997 | -4.14 | 122 |
| 1996 | 1.78 | 81 |
| 1995 | 7.66 | 19 |
| 1994 | 51.42 | 2 |
| 1993 | -3.3 | 99 |
| 1992 | -10.9 | 103 |
| 1991 | -34.08 | 114 |
| 1990 | 33.98 | 2 |
| 1989 | -21.01 | 99 |
| 1988 | -39.29 | 98 |
| 1987 | 5 | 31 |
| 1986 | 4 | 40 |