| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.3 | 37 |
| 2015 | 3.03 | 54 |
| 2014 | 3.49 | 49 |
| 2013 | -1.27 | 170 |
| 2012 | 2.7 | 71 |
| 2011 | -2.85 | 184 |
| 2010 | -8.1 | 194 |
| 2009 | -13.07 | 193 |
| 2008 | -1.14 | 168 |
| 2007 | 8 | 34 |
| 2006 | 11.5 | 11 |
| 2005 | 5.1 | 54 |
| 2004 | 4.66 | 73 |
| 2003 | 4.86 | 52 |
| 2002 | -.33 | 147 |
| 2001 | -6.84 | 191 |
| 2000 | 3.86 | 70 |
| 1999 | 1.2 | 117 |
| 1998 | 1.96 | 110 |
| 1997 | 2.61 | 99 |
| 1996 | 3.77 | 69 |
| 1995 | -6.83 | 173 |
| 1994 | 4.03 | 50 |
| 1993 | 3.01 | 53 |
| 1992 | -.5 | 103 |
| 1991 | 1.25 | 74 |
| 1990 | 2.91 | 60 |
| 1989 | 5.93 | 27 |
| 1988 | 6.45 | 33 |
| 1987 | 8.14 | 15 |
| 1986 | 13.07 | 4 |