| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 52.14 | 99 |
| 2015 | 52.38 | 95 |
| 2014 | 52.7 | 94 |
| 2013 | 53.13 | 91 |
| 2012 | 52.75 | 94 |
| 2011 | 53.03 | 92 |
| 2010 | 53.32 | 87 |
| 2009 | 53.82 | 86 |
| 2008 | 54.21 | 82 |
| 2007 | 54.36 | 79 |
| 2006 | 53.26 | 85 |
| 2005 | 52.42 | 90 |
| 2004 | 50.07 | 102 |
| 2003 | 49.68 | 103 |
| 2002 | 49.19 | 108 |
| 2001 | 48.04 | 113 |
| 2000 | 47.65 | 115 |
| 1999 | 46.56 | 115 |
| 1998 | 44.61 | 122 |
| 1997 | 42.51 | 126 |
| 1996 | 41.52 | 130 |
| 1995 | 39.95 | 134 |
| 1994 | 39.34 | 133 |
| 1993 | 38.27 | 136 |
| 1992 | 36.67 | 140 |
| 1991 | 36.52 | 138 |
| 1990 | 35.79 | 142 |