| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.64 | 60 |
| 2015 | -.16 | 149 |
| 2014 | -.6 | 163 |
| 2013 | -.38 | 155 |
| 2012 | -.08 | 147 |
| 2011 | 2.81 | 88 |
| 2010 | 0.37 | 156 |
| 2009 | -2.31 | 113 |
| 2008 | 5.5 | 40 |
| 2007 | 13.83 | 5 |
| 2006 | 6.58 | 49 |
| 2005 | 5.36 | 52 |
| 2004 | 8.43 | 23 |
| 2003 | 2.36 | 106 |
| 2002 | 3.3 | 58 |
| 2001 | 0.24 | 136 |
| 2000 | 11.97 | 5 |
| 1999 | 8.88 | 12 |
| 1998 | 10.05 | 9 |
| 1997 | 8.56 | 16 |
| 1996 | 8.65 | 12 |
| 1995 | 11.29 | 6 |
| 1994 | 15.99 | 2 |
| 1993 | 5.78 | 19 |
| 1992 | 8.11 | 15 |
| 1991 | -.93 | 106 |
| 1990 | -1.28 | 115 |
| 1989 | 3.96 | 43 |
| 1988 | 4.46 | 50 |
| 1987 | 2.8 | 61 |
| 1986 | 1.23 | 94 |