| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -3.1 | 108 |
| 2015 | 0.08 | 112 |
| 2014 | 3.56 | 25 |
| 2013 | 4.24 | 39 |
| 2012 | 5.07 | 32 |
| 2011 | 8.83 | 16 |
| 2010 | 3.02 | 63 |
| 2009 | -.73 | 88 |
| 2008 | 3.39 | 64 |
| 2007 | 7.91 | 30 |
| 2006 | 4.87 | 53 |
| 2005 | 3.54 | 68 |
| 2004 | 5.33 | 46 |
| 2003 | 0.81 | 100 |
| 2002 | 3.38 | 49 |
| 2001 | -.48 | 112 |
| 2000 | -3.13 | 115 |
| 1999 | 0.32 | 91 |
| 1998 | -3 | 113 |
| 1997 | -.6 | 105 |
| 1996 | 1.93 | 83 |
| 1995 | 0.75 | 79 |
| 1994 | 3.97 | 33 |
| 1993 | 4.19 | 27 |
| 1992 | 6.19 | 16 |
| 1991 | 4.19 | 29 |
| 1990 | 2.18 | 36 |
| 1989 | 0.58 | 57 |
| 1988 | 5.13 | 26 |
| 1987 | 4.19 | 25 |
| 1986 | 4.43 | 23 |