| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.06 | 89 |
| 2015 | -.82 | 120 |
| 2014 | 1.31 | 89 |
| 2013 | 5.1 | 29 |
| 2012 | -.02 | 119 |
| 2011 | 4.69 | 40 |
| 2010 | 3.26 | 57 |
| 2009 | 2.2 | 38 |
| 2008 | 6.31 | 32 |
| 2007 | 4.76 | 60 |
| 2006 | 0.12 | 128 |
| 2005 | 10.74 | 17 |
| 2004 | 3.11 | 82 |
| 2003 | -.15 | 114 |
| 2002 | 2.79 | 59 |
| 2001 | 0.43 | 100 |
| 2000 | -.95 | 100 |
| 1999 | 1.8 | 69 |
| 1998 | 11.35 | 10 |
| 1997 | 5.88 | 28 |
| 1996 | 4.2 | 49 |
| 1995 | 1.19 | 73 |
| 1994 | -1.61 | 83 |
| 1993 | -1.54 | 80 |
| 1992 | -3.17 | 81 |
| 1991 | -1.34 | 75 |