| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.61 | 71 |
| 2015 | 3.04 | 65 |
| 2014 | 2.77 | 71 |
| 2013 | 1.8 | 86 |
| 2012 | 7.17 | 39 |
| 2011 | 3.72 | 57 |
| 2010 | 8.93 | 23 |
| 2009 | 10.4 | 40 |
| 2008 | 4.93 | 62 |
| 2007 | 8.55 | 34 |
| 2006 | 2.26 | 98 |
| 2005 | 7.99 | 38 |
| 2004 | 3.9 | 64 |
| 2003 | 5.13 | 42 |
| 2002 | 3.41 | 73 |
| 2001 | 2.6 | 93 |
| 2000 | 2.76 | 72 |
| 1999 | 3.61 | 52 |
| 1998 | 4.61 | 39 |
| 1997 | 2.77 | 65 |
| 1996 | 9.81 | 19 |
| 1995 | 6.89 | 23 |
| 1994 | 8.46 | 16 |
| 1993 | 5.11 | 36 |
| 1992 | 6.4 | 23 |
| 1991 | 6.19 | 29 |
| 1990 | 6.92 | 14 |
| 1989 | 2.62 | 55 |
| 1988 | 4.03 | 31 |
| 1987 | 0.29 | 67 |
| 1986 | -.69 | 80 |