| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 43.89 | 88 |
| 2015 | 41.9 | 108 |
| 2014 | 43.72 | 95 |
| 2013 | 43.31 | 96 |
| 2012 | 38.93 | 99 |
| 2011 | 36.76 | 107 |
| 2010 | 38.08 | 105 |
| 2009 | 35.84 | 113 |
| 2008 | 36.03 | 104 |
| 2007 | 32.35 | 114 |
| 2006 | 28.71 | 118 |
| 2005 | 29.65 | 112 |
| 2004 | 27.86 | 116 |
| 2003 | 30.09 | 109 |
| 2002 | 32.61 | 97 |
| 2001 | 33 | 94 |
| 2000 | 33.16 | 86 |
| 1999 | 35.4 | 82 |
| 1998 | 32.3 | 87 |
| 1997 | 28.9 | 94 |
| 1996 | 25.24 | 98 |
| 1995 | 20.74 | 110 |
| 1994 | 19.57 | 122 |
| 1993 | 20.1 | 116 |
| 1992 | 18.11 | 119 |
| 1991 | 16.12 | 119 |
| 1990 | 24.06 | 88 |
| 1989 | 22.43 | 93 |
| 1988 | 26.05 | 81 |
| 1987 | 22.46 | 91 |
| 1986 | 22.15 | 91 |