| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | -5 | 122 |
| 2015 | 0.82 | 101 |
| 2014 | 0.69 | 125 |
| 2013 | -.57 | 139 |
| 2012 | 1.43 | 109 |
| 2011 | 3.6 | 93 |
| 2010 | -.79 | 117 |
| 2009 | 17.87 | 8 |
| 2008 | 6.79 | 52 |
| 2007 | -15.06 | 165 |
| 2006 | 2.7 | 89 |
| 2005 | 4.24 | 58 |
| 2004 | 25.79 | 4 |
| 2003 | -21.12 | 167 |
| 2002 | 2.81 | 80 |
| 2001 | 3.88 | 62 |
| 2000 | 6.54 | 41 |
| 1999 | 9.71 | 22 |
| 1998 | 0.15 | 101 |
| 1997 | 8.22 | 16 |
| 1996 | 21.17 | 6 |
| 1995 | -14.65 | 135 |
| 1994 | 4.14 | 42 |
| 1993 | 5.26 | 32 |
| 1992 | -5.31 | 105 |
| 1991 | 5.54 | 32 |
| 1990 | 8.2 | 26 |
| 1989 | 4.41 | 44 |
| 1988 | -2.16 | 92 |
| 1987 | 1.07 | 64 |
| 1986 | -6.99 | 103 |