| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 13.36 | 129 |
| 2015 | 13.35 | 154 |
| 2014 | 14.58 | 156 |
| 2013 | 14.29 | 161 |
| 2012 | 15.27 | 157 |
| 2011 | 15.41 | 158 |
| 2010 | 14.2 | 162 |
| 2009 | 13.79 | 160 |
| 2008 | 15.49 | 159 |
| 2007 | 16.31 | 157 |
| 2006 | 15.71 | 157 |
| 2005 | 15.09 | 158 |
| 2004 | 15.13 | 158 |
| 2003 | 15.27 | 156 |
| 2002 | 17.22 | 146 |
| 2001 | 17.17 | 143 |
| 2000 | 17.75 | 140 |
| 1999 | 22.41 | 121 |
| 1998 | 22.38 | 119 |
| 1997 | 21.86 | 121 |
| 1996 | 21.65 | 118 |
| 1995 | 21.96 | 119 |
| 1994 | 20.28 | 111 |
| 1993 | 20.64 | 105 |
| 1992 | 20.32 | 103 |
| 1991 | 18.74 | 107 |
| 1990 | 18.62 | 106 |
| 1989 | 18.5 | 93 |
| 1988 | 16.8 | 92 |
| 1987 | 14.77 | 99 |
| 1986 | 14.53 | 96 |