| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -.54 | 110 |
| 2015 | -.63 | 153 |
| 2014 | 0.48 | 134 |
| 2013 | 1.53 | 125 |
| 2012 | 1.71 | 153 |
| 2011 | 3.46 | 122 |
| 2010 | 2.69 | 111 |
| 2009 | 3.32 | 85 |
| 2008 | 4.6 | 142 |
| 2007 | 0.51 | 171 |
| 2006 | 2.11 | 144 |
| 2005 | 1.33 | 158 |
| 2004 | -.41 | 166 |
| 2003 | 0.67 | 148 |
| 2002 | 5.69 | 54 |
| 2001 | 1.12 | 149 |
| 2000 | 1.12 | 132 |
| 1999 | 5.19 | 62 |
| 1998 | 5.43 | 80 |
| 1997 | 9 | 48 |
| 1996 | 11.28 | 57 |
| 1995 | 10.04 | 72 |
| 1994 | 12.34 | 71 |
| 1993 | 10.94 | 61 |
| 1992 | 11.95 | 51 |
| 1991 | 19.01 | 44 |
| 1990 | 17.17 | 40 |
| 1989 | 20.25 | 29 |
| 1988 | 16.23 | 35 |
| 1987 | 19.85 | 28 |
| 1986 | 48.16 | 12 |