| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 28.7 | 137 |
| 2015 | 29.27 | 137 |
| 2014 | 29.87 | 136 |
| 2013 | 30.49 | 136 |
| 2012 | 31.13 | 134 |
| 2011 | 31.79 | 133 |
| 2010 | 32.47 | 130 |
| 2009 | 33.18 | 130 |
| 2008 | 33.9 | 129 |
| 2007 | 34.65 | 127 |
| 2006 | 35.41 | 125 |
| 2005 | 36.17 | 124 |
| 2004 | 36.94 | 123 |
| 2003 | 37.72 | 123 |
| 2002 | 38.5 | 122 |
| 2001 | 39.29 | 122 |
| 2000 | 40.08 | 122 |
| 1999 | 40.88 | 121 |
| 1998 | 41.69 | 119 |
| 1997 | 42.46 | 119 |
| 1996 | 43.23 | 118 |
| 1995 | 44 | 116 |
| 1994 | 44.78 | 115 |
| 1993 | 45.56 | 114 |
| 1992 | 46.34 | 111 |
| 1991 | 47.13 | 110 |
| 1990 | 47.92 | 109 |
| 1989 | 48.7 | 106 |
| 1988 | 49.49 | 107 |
| 1987 | 50.28 | 105 |
| 1986 | 51.14 | 104 |