| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.68 | 113 |
| 2015 | 3.04 | 121 |
| 2014 | 6.3 | 109 |
| 2013 | 7.4 | 105 |
| 2012 | 8.85 | 89 |
| 2011 | 14.63 | 57 |
| 2010 | 7.35 | 115 |
| 2009 | 7.74 | 100 |
| 2008 | 10.54 | 107 |
| 2007 | 7.92 | 146 |
| 2006 | 13.63 | 113 |
| 2005 | 8.79 | 126 |
| 2004 | 12.69 | 90 |
| 2003 | 8.63 | 107 |
| 2002 | 6.92 | 112 |
| 2001 | 9.09 | 107 |
| 2000 | 10.05 | 100 |
| 1999 | 12.1 | 92 |
| 1998 | 0.23 | 135 |
| 1997 | 16.04 | 84 |
| 1996 | 18.48 | 65 |
| 1995 | 18.53 | 65 |
| 1994 | 11.51 | 100 |
| 1993 | 26.36 | 45 |
| 1992 | 71.91 | 10 |
| 1991 | 16.88 | 66 |
| 1990 | -43.74 | 125 |
| 1989 | 21.83 | 40 |
| 1988 | 8.58 | 87 |
| 1987 | 2.21 | 109 |
| 1986 | 12.98 | 66 |