| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 11.2 | 10 |
| 2014 | 5.08 | 58 |
| 2013 | 8.82 | 30 |
| 2012 | 7.7 | 31 |
| 2011 | 5.78 | 66 |
| 2010 | -2.41 | 152 |
| 2009 | -7.11 | 124 |
| 2008 | -7.12 | 168 |
| 2007 | -7.67 | 166 |
| 2006 | 4.31 | 101 |
| 2005 | 6.78 | 52 |
| 2004 | 2.8 | 123 |
| 2003 | 9.34 | 41 |
| 2002 | 10.57 | 20 |
| 2001 | 14.69 | 10 |
| 2000 | 9.74 | 35 |
| 1999 | 5.4 | 57 |
| 1998 | 7.27 | 38 |
| 1997 | -1.85 | 135 |
| 1996 | -21.94 | 154 |
| 1995 | -13.57 | 134 |
| 1994 | -25.98 | 130 |
| 1993 | -10.06 | 114 |
| 1992 | -28.53 | 127 |
| 1991 | -7.34 | 112 |
| 1990 | 1.3 | 75 |
| 1989 | 2.3 | 74 |
| 1988 | 14.8 | 12 |
| 1987 | 2.3 | 68 |
| 1986 | 4 | 55 |