| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 8.13 | 15 |
| 2015 | 3.64 | 59 |
| 2014 | 6.53 | 30 |
| 2013 | -1.15 | 133 |
| 2012 | 0.59 | 112 |
| 2011 | -5.92 | 152 |
| 2010 | -10.94 | 154 |
| 2009 | 10.45 | 39 |
| 2008 | 23.59 | 8 |
| 2007 | 7.42 | 40 |
| 2006 | 15.18 | 10 |
| 2005 | -2.46 | 134 |
| 2004 | -4.19 | 133 |
| 2003 | 2.42 | 81 |
| 2002 | 3.95 | 62 |
| 2001 | 1.15 | 108 |
| 2000 | 1.19 | 96 |
| 1999 | 2.37 | 75 |
| 1998 | -1.09 | 103 |
| 1997 | 8.96 | 23 |
| 1996 | 3.53 | 52 |
| 1995 | 8.57 | 14 |
| 1994 | 11.5 | 12 |
| 1993 | 6.24 | 28 |
| 1992 | 0.6 | 73 |
| 1991 | -6.21 | 100 |
| 1990 | -19.43 | 96 |
| 1989 | -2.57 | 88 |
| 1988 | 1.11 | 60 |
| 1987 | 12.87 | 8 |
| 1986 | 4.56 | 36 |