| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.15 | 100 |
| 2015 | 5.32 | 40 |
| 2014 | 1.16 | 102 |
| 2013 | 6.75 | 34 |
| 2012 | 4.53 | 58 |
| 2011 | 5.52 | 42 |
| 2010 | 0.32 | 116 |
| 2009 | 15.67 | 17 |
| 2008 | 10.43 | 25 |
| 2007 | 3.89 | 80 |
| 2006 | 9.61 | 26 |
| 2005 | 6.64 | 44 |
| 2004 | 3.99 | 62 |
| 2003 | 10.03 | 17 |
| 2002 | 12.99 | 16 |
| 2001 | 7.56 | 31 |
| 2000 | 6.49 | 32 |
| 1999 | 0.69 | 99 |
| 1998 | -15.37 | 131 |
| 1997 | 0.06 | 102 |
| 1996 | 2.69 | 63 |
| 1995 | 1.34 | 69 |
| 1994 | 2.31 | 53 |
| 1993 | 0.08 | 79 |
| 1992 | 5.83 | 29 |
| 1991 | 7.03 | 27 |
| 1990 | 3.21 | 42 |
| 1989 | 10.49 | 12 |
| 1988 | 7.57 | 15 |
| 1987 | -.17 | 72 |
| 1986 | 2.78 | 48 |