| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.523 | 123 |
| 2015 | 4.348 | 131 |
| 2014 | 7.14 | 99 |
| 2013 | 9.519 | 74 |
| 2012 | 14.274 | 38 |
| 2011 | 12.052 | 53 |
| 2010 | 12.086 | 53 |
| 2009 | 11.704 | 69 |
| 2008 | 11.288 | 78 |
| 2007 | 10.051 | 91 |
| 2006 | 5.484 | 148 |
| 2005 | 6.831 | 124 |
| 2004 | 7.565 | 114 |
| 2003 | 7.304 | 115 |
| 2002 | 12.032 | 84 |
| 2001 | 18.36 | 53 |
| 2000 | 20.005 | 47 |
| 1999 | 16.937 | 66 |
| 1998 | 24.479 | 37 |
| 1997 | 25.205 | 32 |
| 1996 | 26.075 | 35 |
| 1995 | 33.45 | 27 |
| 1994 | 41.972 | 16 |
| 1993 | 45.062 | 16 |
| 1992 | 49.855 | 9 |
| 1991 | 69.776 | 4 |
| 1990 | 644.496 | 2 |
| 1989 | 81.814 | 4 |
| 1988 | 21.306 | 19 |
| 1987 | 15.34 | 29 |
| 1986 | 15.34 | 28 |