| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 1.76 | 100 |
| 2014 | 3.86 | 77 |
| 2013 | 2.01 | 106 |
| 2012 | 2.35 | 90 |
| 2011 | -1.48 | 155 |
| 2010 | 0.56 | 140 |
| 2009 | -1.33 | 83 |
| 2008 | -6.23 | 167 |
| 2007 | 5.94 | 82 |
| 2006 | -.02 | 146 |
| 2005 | 1.49 | 134 |
| 2004 | 4.06 | 98 |
| 2003 | 3.35 | 93 |
| 2002 | 8.02 | 35 |
| 2001 | 1.06 | 104 |
| 2000 | 0.83 | 130 |
| 1999 | 5.37 | 58 |
| 1998 | -2.06 | 141 |
| 1997 | 1.23 | 112 |
| 1996 | 3.15 | 88 |
| 1995 | 2.88 | 81 |
| 1994 | 6.58 | 44 |
| 1993 | 6.84 | 30 |
| 1992 | 2.41 | 61 |
| 1991 | -4.41 | 105 |
| 1990 | -4.62 | 99 |
| 1989 | -.02 | 89 |
| 1988 | -2.01 | 97 |
| 1987 | -2.26 | 94 |
| 1986 | 1.01 | 82 |