| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | -4.7 | 184 |
| 2014 | 2.87 | 98 |
| 2013 | 3.01 | 98 |
| 2012 | 2.9 | 100 |
| 2011 | 2.68 | 104 |
| 2010 | 0.61 | 162 |
| 2009 | 1.12 | 144 |
| 2008 | 6.98 | 66 |
| 2007 | 8.08 | 62 |
| 2006 | 15.75 | 23 |
| 2005 | 6.57 | 42 |
| 2004 | 6.58 | 44 |
| 2003 | 4.67 | 49 |
| 2002 | 2.25 | 101 |
| 2001 | 0.9 | 133 |
| 2000 | 4.01 | 70 |
| 1999 | 6.85 | 33 |
| 1998 | 2.9 | 82 |
| 1997 | 5.19 | 34 |
| 1996 | 33.57 | 3 |
| 1995 | 7.36 | 15 |
| 1994 | 3.74 | 28 |
| 1993 | -5.29 | 156 |
| 1992 | 18.28 | 2 |
| 1991 | 13.42 | 3 |
| 1990 | -4.32 | 144 |
| 1989 | 4.68 | 15 |
| 1988 | 6 | 10 |
| 1987 | -1.06 | 131 |
| 1986 | -1.05 | 129 |