| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 15.34 | 133 |
| 2015 | 14.79 | 133 |
| 2014 | 14.22 | 132 |
| 2013 | 13.7 | 131 |
| 2012 | 13.23 | 129 |
| 2011 | 12.8 | 130 |
| 2010 | 12.39 | 130 |
| 2009 | 12.05 | 128 |
| 2008 | 11.75 | 128 |
| 2007 | 11.48 | 127 |
| 2006 | 11.21 | 128 |
| 2005 | 10.94 | 126 |
| 2004 | 10.65 | 124 |
| 2003 | 10.34 | 122 |
| 2002 | 10.02 | 117 |
| 2001 | 9.71 | 116 |
| 2000 | 9.41 | 115 |
| 1999 | 9.12 | 111 |
| 1998 | 8.85 | 110 |
| 1997 | 8.6 | 108 |
| 1996 | 8.35 | 106 |
| 1995 | 8.11 | 105 |
| 1994 | 7.85 | 100 |
| 1993 | 7.59 | 96 |
| 1992 | 7.35 | 89 |
| 1991 | 7.12 | 87 |
| 1990 | 6.92 | 83 |
| 1989 | 6.77 | 80 |
| 1988 | 6.66 | 77 |
| 1987 | 6.59 | 74 |
| 1986 | 6.54 | 72 |