| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.72 | 59 |
| 2015 | 3.97 | 57 |
| 2014 | 3.57 | 68 |
| 2013 | 2.74 | 90 |
| 2012 | 5.1 | 69 |
| 2011 | 4.47 | 101 |
| 2010 | 3.56 | 87 |
| 2009 | 5.16 | 57 |
| 2008 | 8.4 | 97 |
| 2007 | 2.28 | 143 |
| 2006 | 3.03 | 120 |
| 2005 | 2.41 | 130 |
| 2004 | 2.74 | 107 |
| 2003 | 7.93 | 43 |
| 2002 | 12.48 | 24 |
| 2001 | 37.68 | 9 |
| 2000 | 96.09 | 4 |
| 1999 | 52.24 | 9 |
| 1998 | 36.1 | 9 |
| 1997 | 30.64 | 14 |
| 1996 | 24.37 | 29 |
| 1995 | 22.89 | 43 |
| 1994 | 27.44 | 46 |
| 1993 | 45 | 26 |
| 1992 | 54.34 | 17 |
| 1991 | 48.8 | 18 |
| 1990 | 48.52 | 13 |
| 1989 | 75.65 | 11 |
| 1988 | 58.22 | 13 |
| 1987 | 29.5 | 16 |
| 1986 | 23.03 | 23 |