| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.51 | 64 |
| 2015 | 1.28 | 97 |
| 2014 | 4.14 | 63 |
| 2013 | 6.36 | 38 |
| 2012 | 4.26 | 81 |
| 2011 | 7.58 | 55 |
| 2010 | 5.98 | 54 |
| 2009 | 0.04 | 149 |
| 2008 | 7.63 | 109 |
| 2007 | 4.52 | 100 |
| 2006 | 6.8 | 60 |
| 2005 | 7.17 | 57 |
| 2004 | 10.46 | 31 |
| 2003 | 15.49 | 18 |
| 2002 | 10.63 | 31 |
| 2001 | 7.81 | 40 |
| 2000 | 25.08 | 15 |
| 1999 | 125.27 | 4 |
| 1998 | 90.98 | 2 |
| 1997 | 27.51 | 17 |
| 1996 | 13.02 | 49 |
| 1995 | 19.59 | 48 |
| 1994 | 6.78 | 96 |
| 1993 | 6.27 | 83 |
| 1992 | 9.86 | 61 |
| 1991 | 13.44 | 55 |
| 1990 | 35.64 | 20 |
| 1989 | 61.33 | 15 |