| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.26 | 108 |
| 2015 | 5.45 | 103 |
| 2014 | 7.91 | 95 |
| 2013 | 22.74 | 13 |
| 2012 | 4.49 | 127 |
| 2011 | 5.08 | 126 |
| 2010 | 6.28 | 126 |
| 2009 | 8.08 | 95 |
| 2008 | 21.27 | 44 |
| 2007 | 41.41 | 17 |
| 2006 | 23.3 | 56 |
| 2005 | 30.65 | 29 |
| 2004 | 23.74 | 35 |
| 2003 | 15.17 | 67 |
| 2002 | 10.52 | 86 |
| 2001 | 21.95 | 57 |
| 2000 | 15.32 | 71 |
| 1999 | 11.45 | 97 |
| 1998 | 4.2 | 115 |
| 1997 | 9.04 | 110 |
| 1996 | 6.86 | 121 |
| 1995 | 10.22 | 96 |
| 1994 | 7.9 | 115 |
| 1993 | -1.58 | 130 |
| 1992 | 4.62 | 104 |
| 1991 | 14.54 | 75 |
| 1990 | -8.2 | 121 |
| 1989 | 8.65 | 94 |
| 1988 | 5.85 | 101 |
| 1987 | 5.5 | 97 |
| 1986 | 4.39 | 100 |