| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 48.25 | 46 |
| 2015 | 48.6 | 46 |
| 2014 | 48.76 | 45 |
| 2013 | 48.86 | 43 |
| 2012 | 49.28 | 44 |
| 2011 | 49.64 | 43 |
| 2010 | 49.79 | 41 |
| 2009 | 50.61 | 39 |
| 2008 | 51.15 | 40 |
| 2007 | 52.41 | 39 |
| 2006 | 52.74 | 36 |
| 2005 | 53.71 | 32 |
| 2004 | 54.79 | 30 |
| 2003 | 56.42 | 26 |
| 2002 | 58.18 | 23 |
| 2001 | 60.04 | 20 |
| 2000 | 62.03 | 19 |
| 1999 | 63.32 | 17 |
| 1998 | 64.77 | 15 |
| 1997 | 66.35 | 14 |
| 1996 | 67.55 | 13 |
| 1995 | 68.6 | 13 |
| 1994 | 69.73 | 11 |
| 1993 | 70.4 | 12 |
| 1992 | 70.87 | 13 |
| 1991 | 70.67 | 12 |