| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 2.36 | 68 |
| 2015 | 2.25 | 73 |
| 2014 | 2.69 | 71 |
| 2013 | 2.43 | 83 |
| 2012 | 1.76 | 92 |
| 2011 | 2.89 | 85 |
| 2010 | 5.97 | 31 |
| 2009 | 0.19 | 73 |
| 2008 | 2.05 | 104 |
| 2007 | 4.93 | 82 |
| 2006 | 4.63 | 82 |
| 2005 | 3.7 | 83 |
| 2004 | 4.48 | 79 |
| 2003 | 2.4 | 104 |
| 2002 | 6.81 | 18 |
| 2001 | 3.73 | 44 |
| 2000 | 8.02 | 16 |
| 1999 | 10.52 | 7 |
| 1998 | -6.15 | 184 |
| 1997 | 4.93 | 44 |
| 1996 | 6.57 | 28 |
| 1995 | 8.47 | 10 |
| 1994 | 8.11 | 10 |
| 1993 | 5.77 | 20 |
| 1992 | 5.08 | 34 |
| 1991 | 9.27 | 6 |
| 1990 | 8.73 | 12 |
| 1989 | 5.98 | 26 |
| 1988 | 10.81 | 9 |
| 1987 | 11.36 | 4 |
| 1986 | 10.12 | 7 |