| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 51.56 | 71 |
| 2015 | 51.83 | 70 |
| 2014 | 51.74 | 69 |
| 2013 | 52.13 | 66 |
| 2012 | 52.01 | 66 |
| 2011 | 51.63 | 67 |
| 2010 | 51.38 | 68 |
| 2009 | 51.34 | 69 |
| 2008 | 51.02 | 74 |
| 2007 | 49.98 | 78 |
| 2006 | 49.2 | 81 |
| 2005 | 48.24 | 84 |
| 2004 | 47.43 | 84 |
| 2003 | 48.4 | 70 |
| 2002 | 47.78 | 77 |
| 2001 | 46.97 | 80 |
| 2000 | 46.26 | 85 |
| 1999 | 46.13 | 83 |
| 1998 | 45.47 | 85 |
| 1997 | 45.6 | 87 |
| 1996 | 45.38 | 90 |
| 1995 | 45.95 | 87 |
| 1994 | 46.11 | 84 |
| 1993 | 43.38 | 94 |
| 1992 | 43.26 | 95 |
| 1991 | 42.15 | 98 |