| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 15.28 | 121 |
| 2015 | 14.72 | 149 |
| 2014 | 14.84 | 154 |
| 2013 | 15.4 | 158 |
| 2012 | 14.27 | 160 |
| 2011 | 15.55 | 156 |
| 2010 | 17.04 | 144 |
| 2009 | 16.8 | 146 |
| 2008 | 20.24 | 136 |
| 2007 | 21.86 | 120 |
| 2006 | 22.59 | 116 |
| 2005 | 26.48 | 97 |
| 2004 | 19.23 | 138 |
| 2003 | 19.72 | 139 |
| 2002 | 19.1 | 136 |
| 2001 | 18.96 | 136 |
| 2000 | 20.76 | 131 |
| 1999 | 20.28 | 127 |
| 1998 | 19.51 | 132 |
| 1997 | 19.03 | 133 |
| 1996 | 18.15 | 133 |
| 1995 | 18.19 | 133 |
| 1994 | 17.8 | 116 |
| 1993 | 17.19 | 113 |
| 1992 | 17.84 | 109 |
| 1991 | 18.07 | 110 |
| 1990 | 15.81 | 117 |
| 1989 | 15.99 | 102 |
| 1988 | 17.05 | 89 |
| 1987 | 16.63 | 91 |
| 1986 | 15.45 | 90 |