| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 55.1 | 54 |
| 2015 | 55.01 | 54 |
| 2014 | 55.04 | 53 |
| 2013 | 55.41 | 52 |
| 2012 | 55.71 | 49 |
| 2011 | 55.88 | 50 |
| 2010 | 55.55 | 51 |
| 2009 | 55.6 | 51 |
| 2008 | 55.97 | 52 |
| 2007 | 55.43 | 54 |
| 2006 | 54.79 | 53 |
| 2005 | 54.04 | 53 |
| 2004 | 52.66 | 58 |
| 2003 | 52.65 | 57 |
| 2002 | 51.94 | 61 |
| 2001 | 51.62 | 62 |
| 2000 | 51.4 | 64 |
| 1999 | 50.31 | 66 |
| 1998 | 49.9 | 65 |
| 1997 | 49.37 | 64 |
| 1996 | 49.37 | 64 |
| 1995 | 49.41 | 63 |
| 1994 | 47.73 | 72 |
| 1993 | 46.66 | 78 |
| 1992 | 46.79 | 79 |
| 1991 | 47.26 | 81 |