| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 11.24 | 46 |
| 2015 | -5.33 | 145 |
| 2014 | 6.11 | 112 |
| 2013 | 6.75 | 111 |
| 2012 | 4.5 | 126 |
| 2011 | 6.42 | 116 |
| 2010 | 6.47 | 121 |
| 2009 | 0.9 | 140 |
| 2008 | 3.09 | 149 |
| 2007 | 18.1 | 84 |
| 2006 | 6.78 | 149 |
| 2005 | 10.52 | 113 |
| 2004 | 6.85 | 129 |
| 2003 | 2.15 | 140 |
| 2002 | 7.43 | 108 |
| 2001 | 16.47 | 73 |
| 2000 | 8.66 | 111 |
| 1999 | 1.7 | 146 |
| 1998 | 15.47 | 53 |
| 1997 | 1.44 | 144 |
| 1996 | 6.91 | 120 |
| 1995 | 3.78 | 135 |
| 1994 | 5.02 | 128 |
| 1993 | -.67 | 127 |
| 1992 | 8.5 | 91 |
| 1991 | 2.93 | 109 |
| 1990 | 5.55 | 98 |
| 1989 | 8.61 | 95 |
| 1988 | 4.91 | 105 |
| 1987 | 19.19 | 50 |
| 1986 | 2.75 | 105 |