| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 22.22 | 95 |
| 2015 | 21.4 | 118 |
| 2014 | 20.48 | 126 |
| 2013 | 21 | 125 |
| 2012 | 24.91 | 99 |
| 2011 | 27.15 | 89 |
| 2010 | 23 | 114 |
| 2009 | 19.32 | 136 |
| 2008 | 16.22 | 155 |
| 2007 | 18.96 | 141 |
| 2006 | 17.62 | 146 |
| 2005 | 17.98 | 140 |
| 2004 | 21.18 | 131 |
| 2003 | 21.18 | 134 |
| 2002 | 17.52 | 144 |
| 2001 | 19.48 | 132 |
| 2000 | 21.53 | 127 |
| 1999 | 25.19 | 97 |
| 1998 | 19.32 | 134 |
| 1997 | 21.45 | 123 |
| 1996 | 20.02 | 126 |
| 1995 | 21.52 | 121 |
| 1994 | 22.01 | 103 |
| 1993 | 20.6 | 106 |
| 1992 | 21.22 | 96 |
| 1991 | 20.18 | 102 |
| 1990 | 21.24 | 96 |
| 1989 | 23.14 | 81 |
| 1988 | 22.56 | 77 |
| 1987 | 23.41 | 73 |
| 1986 | 21.79 | 71 |