| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.33 | 84 |
| 2015 | 0.81 | 102 |
| 2014 | 4.55 | 49 |
| 2013 | 1.1 | 116 |
| 2012 | 4.63 | 51 |
| 2011 | 4.51 | 70 |
| 2010 | 2.01 | 80 |
| 2009 | 3.02 | 81 |
| 2008 | 5.82 | 59 |
| 2007 | 0.97 | 116 |
| 2006 | 1.78 | 101 |
| 2005 | 3.5 | 64 |
| 2004 | 4.81 | 65 |
| 2003 | 3.33 | 69 |
| 2002 | 3.08 | 71 |
| 2001 | 4.3 | 58 |
| 2000 | 4.97 | 52 |
| 1999 | 2.72 | 86 |
| 1998 | 1.04 | 93 |
| 1997 | 4.13 | 54 |
| 1996 | 4.42 | 59 |
| 1995 | -.33 | 97 |
| 1994 | 7.6 | 21 |
| 1993 | -.62 | 86 |
| 1992 | -1.06 | 85 |
| 1991 | 2.15 | 63 |
| 1990 | 5.77 | 36 |
| 1989 | 6.17 | 28 |
| 1988 | 6.56 | 35 |
| 1987 | -.7 | 72 |
| 1986 | 2.7 | 54 |