| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.5 | 37 |
| 2015 | 7.72 | 29 |
| 2014 | 8.51 | 21 |
| 2013 | 22.19 | 7 |
| 2012 | 9.3 | 20 |
| 2011 | 4.02 | 95 |
| 2010 | 0.25 | 143 |
| 2009 | -7.8 | 132 |
| 2008 | 3.57 | 85 |
| 2007 | 9.82 | 33 |
| 2006 | 3.53 | 115 |
| 2005 | 2.96 | 107 |
| 2004 | 6.55 | 65 |
| 2003 | 14.49 | 17 |
| 2002 | -20.74 | 170 |
| 2001 | 7.48 | 31 |
| 2000 | 7.16 | 50 |
| 1999 | 4.25 | 69 |
| 1998 | 5.29 | 56 |
| 1997 | 4.65 | 77 |
| 1996 | 1.98 | 106 |
| 1995 | 1.75 | 90 |
| 1994 | -1.05 | 103 |
| 1993 | 3.27 | 53 |
| 1992 | -1.07 | 90 |
| 1991 | -.39 | 84 |
| 1990 | -.62 | 85 |
| 1989 | 1.24 | 81 |
| 1988 | 1.77 | 74 |
| 1987 | 4.71 | 50 |
| 1986 | 3.81 | 59 |