| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 5.93 | 28 |
| 2015 | 2.9 | 80 |
| 2014 | 5.72 | 49 |
| 2013 | 30.53 | 5 |
| 2012 | -11.71 | 173 |
| 2011 | 6.96 | 55 |
| 2010 | 2.53 | 126 |
| 2009 | -.32 | 77 |
| 2008 | 13.95 | 16 |
| 2007 | 10.3 | 30 |
| 2006 | -7.05 | 162 |
| 2005 | -9.85 | 168 |
| 2004 | 3.05 | 113 |
| 2003 | 12.73 | 22 |
| 2002 | -9.03 | 157 |
| 2001 | 4.5 | 60 |
| 2000 | 10.16 | 32 |
| 1999 | -3.81 | 141 |
| 1998 | -1.79 | 138 |
| 1997 | 19.8 | 8 |
| 1996 | 2.56 | 97 |
| 1995 | -12.28 | 130 |
| 1994 | -37.3 | 133 |
| 1993 | -22.87 | 130 |
| 1992 | -26.08 | 125 |
| 1991 | -7.49 | 113 |
| 1990 | -2.18 | 93 |
| 1989 | 2.73 | 71 |
| 1988 | 19.05 | 7 |