| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 18.43 | 140 |
| 2015 | 17.73 | 139 |
| 2014 | 17.02 | 139 |
| 2013 | 16.36 | 138 |
| 2012 | 15.73 | 137 |
| 2011 | 15.15 | 137 |
| 2010 | 14.63 | 137 |
| 2009 | 14.11 | 137 |
| 2008 | 13.63 | 136 |
| 2007 | 13.19 | 136 |
| 2006 | 12.73 | 135 |
| 2005 | 12.26 | 134 |
| 2004 | 11.8 | 133 |
| 2003 | 11.33 | 131 |
| 2002 | 10.84 | 128 |
| 2001 | 10.37 | 124 |
| 2000 | 9.95 | 120 |
| 1999 | 9.58 | 118 |
| 1998 | 9.24 | 115 |
| 1997 | 8.94 | 114 |
| 1996 | 8.67 | 112 |
| 1995 | 8.42 | 109 |
| 1994 | 8.2 | 105 |
| 1993 | 8.02 | 105 |
| 1992 | 7.87 | 104 |
| 1991 | 7.71 | 104 |
| 1990 | 7.55 | 100 |
| 1989 | 7.42 | 93 |
| 1988 | 7.28 | 90 |
| 1987 | 7.12 | 87 |
| 1986 | 6.97 | 86 |