| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 52.35 | 68 |
| 2015 | 52.23 | 67 |
| 2014 | 51.97 | 68 |
| 2013 | 51.58 | 68 |
| 2012 | 50.88 | 73 |
| 2011 | 50.62 | 75 |
| 2010 | 49.33 | 77 |
| 2009 | 48.64 | 81 |
| 2008 | 48.07 | 88 |
| 2007 | 47.34 | 90 |
| 2006 | 46.14 | 93 |
| 2005 | 45.05 | 95 |
| 2004 | 45.13 | 94 |
| 2003 | 45.01 | 97 |
| 2002 | 45.63 | 90 |
| 2001 | 45.75 | 91 |
| 2000 | 45.32 | 94 |
| 1999 | 44.79 | 94 |
| 1998 | 43.92 | 95 |
| 1997 | 43.46 | 95 |
| 1996 | 43.53 | 96 |
| 1995 | 43.22 | 96 |
| 1994 | 42.66 | 100 |
| 1993 | 43.23 | 95 |
| 1992 | 43.8 | 93 |
| 1991 | 44.85 | 87 |