| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.35 | 78 |
| 2015 | 2.07 | 86 |
| 2014 | 0.8 | 109 |
| 2013 | 0.7 | 113 |
| 2012 | 0.16 | 119 |
| 2011 | 0.02 | 111 |
| 2010 | 0.13 | 120 |
| 2009 | 2.46 | 104 |
| 2008 | 3.68 | 79 |
| 2007 | 1.44 | 114 |
| 2006 | 3.21 | 87 |
| 2005 | 2.25 | 91 |
| 2004 | 1.42 | 101 |
| 2003 | 1.03 | 108 |
| 2002 | 0.87 | 108 |
| 2001 | -.24 | 120 |
| 2000 | -.02 | 109 |
| 1999 | 3.47 | 58 |
| 1998 | 2.92 | 68 |
| 1997 | 2.84 | 64 |
| 1996 | 1.22 | 87 |
| 1995 | 2.63 | 56 |
| 1994 | 2.96 | 50 |
| 1993 | 3.84 | 44 |
| 1992 | 3.04 | 47 |
| 1991 | 3 | 59 |
| 1990 | 2.11 | 55 |
| 1989 | 1.65 | 61 |
| 1988 | 1.74 | 52 |
| 1987 | 0.07 | 70 |
| 1986 | 1.69 | 59 |