| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 5.26 | 48 |
| 2014 | 3.4 | 83 |
| 2013 | 6.23 | 47 |
| 2012 | 7.46 | 32 |
| 2011 | 2.44 | 118 |
| 2010 | 12.08 | 23 |
| 2009 | -15.88 | 164 |
| 2008 | 3.9 | 80 |
| 2007 | 8.48 | 45 |
| 2006 | 15.01 | 19 |
| 2005 | 0.86 | 141 |
| 2004 | 16.08 | 13 |
| 2003 | 5.47 | 71 |
| 2002 | 8.73 | 29 |
| 2001 | 1.54 | 97 |
| 2000 | 1.93 | 119 |
| 1999 | 1.59 | 107 |
| 1998 | 5.03 | 59 |
| 1997 | 6.44 | 54 |
| 1996 | -5.88 | 147 |
| 1995 | 2.3 | 85 |
| 1994 | 9.44 | 23 |
| 1993 | -12.83 | 119 |
| 1992 | 15.71 | 9 |
| 1991 | 1.3 | 70 |
| 1990 | 1.65 | 69 |
| 1989 | 0.56 | 87 |
| 1988 | 2.67 | 69 |
| 1987 | 1.86 | 72 |
| 1986 | 4.7 | 49 |