| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.73 | 79 |
| 2015 | 1.06 | 96 |
| 2014 | 0.79 | 99 |
| 2013 | 1.46 | 83 |
| 2012 | 2.12 | 76 |
| 2011 | 1.03 | 106 |
| 2010 | 2.48 | 70 |
| 2009 | -1.23 | 95 |
| 2008 | 0.42 | 103 |
| 2007 | 4.22 | 63 |
| 2006 | 4.12 | 59 |
| 2005 | 3.69 | 66 |
| 2004 | 4.83 | 51 |
| 2003 | 2.59 | 67 |
| 2002 | 2.58 | 61 |
| 2001 | 1.55 | 74 |
| 2000 | 3.51 | 39 |
| 1999 | 3.03 | 52 |
| 1998 | 2.22 | 75 |
| 1997 | 2.56 | 64 |
| 1996 | 5.79 | 33 |
| 1995 | 3.08 | 46 |
| 1994 | 2.81 | 41 |
| 1993 | 1.66 | 48 |
| 1992 | 1.78 | 46 |
| 1991 | 1.6 | 52 |
| 1990 | 0.35 | 57 |
| 1989 | -1.02 | 68 |
| 1988 | -2.64 | 76 |
| 1987 | -1.08 | 65 |
| 1986 | 4.68 | 21 |