| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 4.24 | 26 |
| 2014 | 0.8 | 134 |
| 2013 | 2.48 | 81 |
| 2012 | 2.77 | 70 |
| 2011 | 2.61 | 93 |
| 2010 | 2.26 | 107 |
| 2009 | 1.37 | 51 |
| 2008 | 4.06 | 67 |
| 2007 | 7.19 | 42 |
| 2006 | 11.95 | 10 |
| 2005 | 11.03 | 12 |
| 2004 | 5.56 | 55 |
| 2003 | 3.54 | 75 |
| 2002 | 1.14 | 120 |
| 2001 | 2.85 | 67 |
| 2000 | 5.53 | 39 |
| 1999 | 5.75 | 25 |
| 1998 | -.29 | 154 |
| 1997 | 2.29 | 104 |
| 1996 | 7.3 | 23 |
| 1995 | 1.94 | 102 |
| 1994 | 0.19 | 127 |
| 1993 | -15.36 | 170 |
| 1992 | -12.16 | 166 |
| 1991 | -11.38 | 167 |
| 1990 | -3.83 | 141 |
| 1989 | -.35 | 119 |
| 1988 | 2.61 | 87 |
| 1987 | -3.37 | 138 |
| 1986 | -.74 | 115 |