| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 2.15 | 83 |
| 2014 | 1.47 | 96 |
| 2013 | 2.3 | 76 |
| 2012 | 2.15 | 92 |
| 2011 | 2.07 | 82 |
| 2010 | 0.2 | 117 |
| 2009 | 3.53 | 90 |
| 2008 | -1.88 | 146 |
| 2007 | 0.13 | 135 |
| 2006 | 0.15 | 124 |
| 2005 | 1.09 | 111 |
| 2004 | 0.8 | 110 |
| 2003 | 2.37 | 84 |
| 2002 | 1.63 | 104 |
| 2001 | 2.25 | 97 |
| 2000 | 2.68 | 73 |
| 1999 | 0.69 | 100 |
| 1998 | 0.48 | 98 |
| 1997 | 0.62 | 97 |
| 1996 | 1.55 | 84 |
| 1995 | 0.49 | 78 |
| 1994 | 2.11 | 56 |
| 1993 | -1.18 | 91 |
| 1992 | 0.9 | 66 |
| 1991 | 1.88 | 71 |
| 1990 | 4.65 | 30 |
| 1989 | 8.77 | 15 |
| 1988 | 4.57 | 26 |
| 1987 | 2.31 | 51 |
| 1986 | 3.21 | 45 |