| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 2.95 | 123 |
| 2014 | 6.51 | 107 |
| 2013 | 8.2 | 97 |
| 2012 | 4.05 | 130 |
| 2011 | 3.4 | 133 |
| 2010 | 10.51 | 96 |
| 2009 | 5.81 | 112 |
| 2008 | 19.68 | 53 |
| 2007 | 39.3 | 23 |
| 2006 | 14.89 | 105 |
| 2005 | 21.99 | 46 |
| 2004 | 4.15 | 142 |
| 2003 | 6.36 | 120 |
| 2002 | 10.34 | 90 |
| 2001 | 9.24 | 106 |
| 2000 | 10.22 | 99 |
| 1999 | 4.12 | 137 |
| 1998 | 16.76 | 44 |
| 1997 | 7.85 | 118 |
| 1996 | 3.1 | 142 |
| 1995 | 7.42 | 113 |
| 1994 | 5.98 | 125 |
| 1993 | 5.73 | 108 |
| 1992 | 4.86 | 103 |
| 1991 | 23.21 | 45 |
| 1990 | -11.56 | 122 |
| 1989 | 4.45 | 112 |
| 1988 | 4.04 | 108 |
| 1987 | 9.41 | 87 |
| 1986 | -2.01 | 114 |