| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 0.11 | 124 |
| 2015 | 0.19 | 117 |
| 2014 | 0.28 | 111 |
| 2013 | 0.36 | 111 |
| 2012 | 0.45 | 105 |
| 2011 | 0.53 | 101 |
| 2010 | 0.63 | 100 |
| 2009 | 0.74 | 94 |
| 2008 | 0.87 | 89 |
| 2007 | 1.05 | 76 |
| 2006 | 1.26 | 74 |
| 2005 | 0.9 | 91 |
| 2004 | 1.05 | 84 |
| 2003 | 1.21 | 70 |
| 2002 | 1.32 | 72 |
| 2001 | 1.35 | 67 |
| 2000 | 1.43 | 66 |
| 1999 | 1.48 | 68 |
| 1998 | 1.24 | 74 |
| 1997 | 0.6 | 106 |
| 1996 | -.31 | 153 |
| 1995 | -1.43 | 181 |
| 1994 | -2.33 | 193 |
| 1993 | -2.61 | 195 |
| 1992 | -2.05 | 192 |
| 1991 | -.93 | 173 |
| 1990 | 0.43 | 125 |
| 1989 | 1.63 | 74 |
| 1988 | 2.5 | 33 |
| 1987 | 2.79 | 28 |
| 1986 | 2.59 | 36 |