| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 3.52 | 43 |
| 2015 | 4 | 56 |
| 2014 | 6.04 | 40 |
| 2013 | 7.14 | 30 |
| 2012 | 7.19 | 40 |
| 2011 | 8.08 | 49 |
| 2010 | 5.45 | 59 |
| 2009 | 3.69 | 76 |
| 2008 | 19.83 | 20 |
| 2007 | 11.13 | 19 |
| 2006 | 9.14 | 35 |
| 2005 | 9.6 | 37 |
| 2004 | 8.47 | 36 |
| 2003 | 5.3 | 65 |
| 2002 | 3.75 | 73 |
| 2001 | 5.99 | 54 |
| 2000 | 9.87 | 35 |
| 1999 | 11.22 | 30 |
| 1998 | 13.04 | 32 |
| 1997 | 9.22 | 46 |
| 1996 | 11.62 | 54 |
| 1995 | 10.94 | 66 |
| 1994 | 6.71 | 97 |
| 1993 | 20.4 | 44 |
| 1992 | 23.67 | 32 |
| 1991 | 2945.09 | 1 |
| 1990 | 7485.49 | 1 |
| 1989 | 4770.19 | 1 |
| 1988 | 10205.03 | 1 |
| 1987 | 911.93 | 1 |
| 1986 | 681.42 | 1 |