| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 4.87 | 36 |
| 2015 | 5.77 | 38 |
| 2014 | 8.26 | 20 |
| 2013 | 7.54 | 30 |
| 2012 | 8.27 | 33 |
| 2011 | 7.38 | 29 |
| 2010 | 3.9 | 56 |
| 2009 | 12.07 | 33 |
| 2008 | 4.84 | 66 |
| 2007 | 4.3 | 75 |
| 2006 | 7.6 | 42 |
| 2005 | 9.1 | 31 |
| 2004 | 4.1 | 60 |
| 2003 | 3.9 | 56 |
| 2002 | 0 | 112 |
| 2001 | -.8 | 122 |
| 2000 | 3.1 | 64 |
| 1999 | 3.5 | 55 |
| 1998 | 2.5 | 75 |
| 1997 | 7.6 | 27 |
| 1996 | 4.4 | 44 |
| 1995 | 8.5 | 15 |
| 1994 | 8.67 | 14 |
| 1993 | 3.09 | 50 |
| 1992 | 2.83 | 51 |
| 1991 | 1.96 | 69 |
| 1990 | -10.18 | 93 |
| 1989 | -19.07 | 97 |
| 1988 | -15.77 | 92 |
| 1987 | 5.72 | 27 |
| 1986 | 7.95 | 19 |