| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 1.102 | 109 |
| 2015 | 1.047 | 122 |
| 2014 | 1.048 | 134 |
| 2013 | 1.011 | 139 |
| 2012 | 0.996 | 143 |
| 2011 | 1.847 | 128 |
| 2010 | 2.991 | 106 |
| 2009 | 6.008 | 66 |
| 2008 | 6.573 | 64 |
| 2007 | 6.075 | 67 |
| 2006 | 4.865 | 74 |
| 2005 | 4.03 | 80 |
| 2004 | 4.716 | 69 |
| 2003 | 5.552 | 60 |
| 2002 | 7.789 | 51 |
| 2001 | 11.559 | 30 |
| 2000 | 10.798 | 37 |
| 1999 | 11.828 | 39 |
| 1998 | 10.768 | 53 |
| 1997 | 12.407 | 49 |
| 1996 | 12.345 | 56 |
| 1995 | 11.147 | 56 |
| 1994 | 11.696 | 41 |
| 1993 | 11.61 | 44 |
| 1992 | 12.011 | 43 |
| 1991 | 11.625 | 47 |
| 1990 | 9.5 | 53 |
| 1989 | 1585.895 | 3 |
| 1988 | 107379.12 | 1 |