| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 39.62 | 97 |
| 2015 | 38.88 | 115 |
| 2014 | 36.83 | 112 |
| 2013 | 36.24 | 113 |
| 2012 | 33.53 | 113 |
| 2011 | 32.88 | 120 |
| 2010 | 34.21 | 119 |
| 2009 | 31.16 | 123 |
| 2008 | 27.94 | 126 |
| 2007 | 31.29 | 117 |
| 2006 | 30.44 | 114 |
| 2005 | 31.54 | 108 |
| 2004 | 32.92 | 101 |
| 2003 | 32.25 | 102 |
| 2002 | 30.92 | 101 |
| 2001 | 28.39 | 106 |
| 2000 | 30.11 | 95 |
| 1999 | 31.11 | 93 |
| 1998 | 30.61 | 90 |
| 1997 | 27.39 | 95 |
| 1996 | 20.5 | 116 |
| 1995 | 15.66 | 134 |
| 1994 | 13.93 | 130 |
| 1993 | 20.27 | 115 |
| 1992 | 19.42 | 115 |
| 1991 | 20.08 | 105 |
| 1990 | 57.21 | 32 |
| 1989 | 37.61 | 57 |
| 1988 | 63.5 | 24 |
| 1987 | 60.44 | 25 |
| 1986 | 58.04 | 24 |