| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 2.72 | 81 |
| 2014 | 6.11 | 37 |
| 2013 | -2.55 | 154 |
| 2012 | 5.03 | 44 |
| 2011 | 12.32 | 15 |
| 2010 | -7.88 | 160 |
| 2009 | 0.88 | 102 |
| 2008 | 9.58 | 27 |
| 2007 | -15.82 | 166 |
| 2006 | 0.31 | 119 |
| 2005 | 5.19 | 47 |
| 2004 | -3.07 | 154 |
| 2003 | 11.22 | 18 |
| 2002 | -.57 | 120 |
| 2001 | -1.84 | 121 |
| 2000 | 3.62 | 66 |
| 1999 | 4.79 | 61 |
| 1998 | -4.35 | 131 |
| 1997 | 0.39 | 100 |
| 1996 | 8.82 | 27 |
| 1995 | 7.16 | 28 |
| 1994 | 0.21 | 85 |
| 1993 | 17.02 | 9 |
| 1992 | -12.39 | 118 |
| 1991 | 0.58 | 77 |
| 1990 | 17.4 | 8 |
| 1989 | -5.41 | 101 |
| 1988 | -2.83 | 94 |
| 1987 | 10.19 | 14 |
| 1986 | -1.84 | 88 |