| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 6.31 | 26 |
| 2015 | 7.98 | 25 |
| 2014 | 0.13 | 116 |
| 2013 | 11.51 | 18 |
| 2012 | -1.49 | 136 |
| 2011 | -2.28 | 139 |
| 2010 | 10.74 | 18 |
| 2009 | 4.17 | 79 |
| 2008 | 5.92 | 52 |
| 2007 | 2.72 | 96 |
| 2006 | 7.8 | 40 |
| 2005 | 5.03 | 54 |
| 2004 | 1.47 | 98 |
| 2003 | 0.37 | 114 |
| 2002 | 5.35 | 48 |
| 2001 | 4.43 | 56 |
| 2000 | 20.86 | 5 |
| 1999 | 7.15 | 29 |
| 1998 | 8.92 | 23 |
| 1997 | 6.96 | 31 |
| 1996 | 18.75 | 12 |
| 1995 | 11.07 | 7 |
| 1994 | -1.77 | 93 |
| 1993 | 15.7 | 10 |
| 1992 | 2.46 | 55 |
| 1991 | 8.15 | 23 |
| 1990 | 10.77 | 9 |
| 1989 | 6.11 | 27 |
| 1988 | -5.99 | 88 |
| 1987 | 1.23 | 60 |
| 1986 | 0.92 | 72 |