| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.18 | 106 |
| 2015 | 1.14 | 112 |
| 2014 | 1.52 | 106 |
| 2013 | 0.61 | 127 |
| 2012 | 1 | 109 |
| 2011 | 0.46 | 142 |
| 2010 | 4.05 | 100 |
| 2009 | 5.47 | 30 |
| 2008 | 6.62 | 47 |
| 2007 | 7.5 | 60 |
| 2006 | 10.52 | 39 |
| 2005 | 3.7 | 98 |
| 2004 | 2.8 | 120 |
| 2003 | 1.46 | 122 |
| 2002 | 3.59 | 84 |
| 2001 | 3.13 | 73 |
| 2000 | 5.29 | 69 |
| 1999 | 6.6 | 44 |
| 1998 | 3.98 | 78 |
| 1997 | 4.6 | 78 |
| 1996 | 4.91 | 67 |
| 1995 | 5.01 | 58 |
| 1994 | 5.45 | 51 |
| 1993 | 2.23 | 61 |
| 1992 | 1.5 | 68 |
| 1991 | 20.15 | 6 |
| 1990 | 9.66 | 20 |
| 1989 | 2.68 | 72 |
| 1988 | 5.93 | 44 |
| 1987 | -11.32 | 103 |
| 1986 | 1.69 | 73 |