| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.09 | 45 |
| 2015 | 24.67 | 1 |
| 2014 | 8.02 | 2 |
| 2013 | 0.85 | 128 |
| 2012 | -1.32 | 165 |
| 2011 | -.4 | 165 |
| 2010 | 1.48 | 131 |
| 2009 | -5.53 | 165 |
| 2008 | -6.3 | 194 |
| 2007 | 0.84 | 161 |
| 2006 | 3.05 | 118 |
| 2005 | 3.49 | 90 |
| 2004 | 4.79 | 69 |
| 2003 | 2 | 116 |
| 2002 | 3.81 | 50 |
| 2001 | 4.38 | 36 |
| 2000 | 8.46 | 12 |
| 1999 | 9.62 | 8 |
| 1998 | 7.1 | 19 |
| 1997 | 9.64 | 13 |
| 1996 | 8.23 | 15 |
| 1995 | 9.07 | 9 |
| 1994 | 5.34 | 31 |
| 1993 | 2.18 | 70 |
| 1992 | 2.64 | 58 |
| 1991 | 1.35 | 72 |
| 1990 | 8.38 | 13 |
| 1989 | 6.23 | 22 |
| 1988 | 5.67 | 38 |
| 1987 | 4.65 | 39 |
| 1986 | -.47 | 112 |