| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.68 | 124 |
| 2015 | 0.73 | 123 |
| 2014 | 2.24 | 85 |
| 2013 | 3.31 | 57 |
| 2012 | 1.35 | 113 |
| 2011 | 4.03 | 65 |
| 2010 | 13.22 | 2 |
| 2009 | -3.56 | 134 |
| 2008 | -3.49 | 187 |
| 2007 | 4.66 | 91 |
| 2006 | 5.51 | 63 |
| 2005 | 4.99 | 57 |
| 2004 | 8.19 | 24 |
| 2003 | 5.99 | 38 |
| 2002 | 3.26 | 59 |
| 2001 | -3.59 | 181 |
| 2000 | 7.03 | 20 |
| 1999 | 5.25 | 29 |
| 1998 | -5.49 | 183 |
| 1997 | 4.72 | 49 |
| 1996 | 3.25 | 81 |
| 1995 | 3.83 | 53 |
| 1994 | 7.5 | 13 |
| 1993 | 8.75 | 9 |
| 1992 | 3.92 | 41 |
| 1991 | 3.69 | 35 |
| 1990 | 5.85 | 20 |
| 1989 | 7 | 17 |
| 1988 | 8.33 | 20 |
| 1987 | 9.1 | 11 |
| 1986 | 1.42 | 89 |