| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.97 | 94 |
| 2015 | 2.23 | 89 |
| 2014 | 3.93 | 75 |
| 2013 | 2.29 | 98 |
| 2012 | 0.77 | 114 |
| 2011 | 3.34 | 105 |
| 2010 | 1.18 | 137 |
| 2009 | 0.41 | 66 |
| 2008 | 8.02 | 39 |
| 2007 | 9.06 | 41 |
| 2006 | 9.71 | 44 |
| 2005 | 7.14 | 48 |
| 2004 | 13.01 | 21 |
| 2003 | 1.84 | 115 |
| 2002 | 14.92 | 12 |
| 2001 | 8.65 | 24 |
| 2000 | 4.1 | 89 |
| 1999 | 6.66 | 43 |
| 1998 | 1.53 | 105 |
| 1997 | 5.48 | 66 |
| 1996 | -4.59 | 144 |
| 1995 | 2.89 | 79 |
| 1994 | 12.05 | 16 |
| 1993 | 8.5 | 18 |
| 1992 | 19.17 | 7 |
| 1991 | -1.13 | 88 |
| 1990 | -2.22 | 94 |
| 1989 | 9.26 | 21 |
| 1988 | -15.2 | 110 |
| 1987 | 1.25 | 76 |
| 1986 | 1.37 | 78 |