| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.21 | 29 |
| 2015 | 26.28 | 1 |
| 2014 | 8.46 | 6 |
| 2013 | 1.1 | 154 |
| 2012 | -1.1 | 175 |
| 2011 | -.04 | 177 |
| 2010 | 2.03 | 144 |
| 2009 | -4.57 | 164 |
| 2008 | -4.37 | 195 |
| 2007 | 3.8 | 134 |
| 2006 | 5.87 | 86 |
| 2005 | 5.77 | 80 |
| 2004 | 6.72 | 62 |
| 2003 | 3.67 | 112 |
| 2002 | 5.58 | 42 |
| 2001 | 6.05 | 32 |
| 2000 | 9.91 | 13 |
| 1999 | 10.86 | 11 |
| 1998 | 8.23 | 17 |
| 1997 | 10.75 | 13 |
| 1996 | 9.09 | 21 |
| 1995 | 9.63 | 13 |
| 1994 | 5.76 | 50 |
| 1993 | 2.69 | 88 |
| 1992 | 3.34 | 74 |
| 1991 | 1.93 | 92 |
| 1990 | 8.47 | 18 |
| 1989 | 5.81 | 43 |
| 1988 | 5.22 | 71 |
| 1987 | 4.66 | 60 |
| 1986 | -.43 | 135 |