| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 55.25 | 80 |
| 2015 | 55.33 | 80 |
| 2014 | 55.41 | 78 |
| 2013 | 55.59 | 77 |
| 2012 | 55.77 | 77 |
| 2011 | 55.95 | 72 |
| 2010 | 54.81 | 81 |
| 2009 | 53.67 | 87 |
| 2008 | 52.44 | 92 |
| 2007 | 51.02 | 95 |
| 2006 | 56.89 | 66 |
| 2005 | 56.08 | 67 |
| 2004 | 53.18 | 82 |
| 2003 | 53.56 | 81 |
| 2002 | 54 | 75 |
| 2001 | 55.67 | 68 |
| 2000 | 55.45 | 67 |
| 1999 | 55.15 | 68 |
| 1998 | 54.83 | 67 |
| 1997 | 54.5 | 69 |
| 1996 | 54.14 | 71 |
| 1995 | 53.77 | 73 |
| 1994 | 53.32 | 75 |
| 1993 | 52.85 | 78 |
| 1992 | 52.38 | 77 |
| 1991 | 51.89 | 81 |
| 1990 | 51.39 | 81 |