| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 7.89 | 27 |
| 2014 | 0.26 | 126 |
| 2013 | -8.96 | 169 |
| 2012 | 5.11 | 47 |
| 2011 | 3.26 | 106 |
| 2010 | 6.87 | 66 |
| 2009 | -6.31 | 116 |
| 2008 | 8.76 | 31 |
| 2007 | 6.97 | 69 |
| 2006 | 6.45 | 68 |
| 2005 | 2.31 | 120 |
| 2004 | 0.12 | 151 |
| 2003 | 7.55 | 50 |
| 2002 | 6.39 | 49 |
| 2001 | 5.74 | 41 |
| 2000 | 14.35 | 13 |
| 1999 | 5.68 | 52 |
| 1998 | 1.7 | 103 |
| 1997 | -2.2 | 139 |
| 1996 | 7.5 | 33 |
| 1995 | 11.72 | 17 |
| 1994 | 9.21 | 26 |
| 1993 | 4.06 | 48 |
| 1992 | 11.45 | 17 |
| 1991 | 48.17 | 1 |
| 1990 | 17.92 | 7 |
| 1989 | 20.77 | 4 |
| 1988 | 30.47 | 1 |
| 1987 | 6.24 | 37 |
| 1986 | 2.58 | 65 |