| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.76 | 35 |
| 2015 | 1.82 | 74 |
| 2014 | 0.48 | 106 |
| 2013 | 0.49 | 106 |
| 2012 | 6.22 | 24 |
| 2011 | 1.35 | 99 |
| 2010 | 4.94 | 37 |
| 2009 | -1.4 | 98 |
| 2008 | 2.29 | 74 |
| 2007 | 0.62 | 124 |
| 2006 | 2.18 | 87 |
| 2005 | 3.53 | 69 |
| 2004 | 6.69 | 37 |
| 2003 | 6.55 | 32 |
| 2002 | 5.34 | 35 |
| 2001 | 4.92 | 28 |
| 2000 | 5.93 | 25 |
| 1999 | 2.88 | 55 |
| 1998 | -11.27 | 123 |
| 1997 | -2.56 | 111 |
| 1996 | 3.88 | 52 |
| 1995 | 7.21 | 23 |
| 1994 | 6.89 | 13 |
| 1993 | 7.44 | 13 |
| 1992 | 7.61 | 11 |
| 1991 | 4.18 | 30 |
| 1990 | 11.31 | 6 |
| 1989 | 9.45 | 9 |
| 1988 | 6.87 | 16 |
| 1987 | 6.72 | 13 |
| 1986 | 1.69 | 51 |