| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 51.71 | 70 |
| 2015 | 52.04 | 68 |
| 2014 | 51.65 | 71 |
| 2013 | 51.43 | 69 |
| 2012 | 50.74 | 74 |
| 2011 | 50.35 | 76 |
| 2010 | 48.15 | 83 |
| 2009 | 49.75 | 75 |
| 2008 | 52.29 | 65 |
| 2007 | 52.29 | 65 |
| 2006 | 51.97 | 65 |
| 2005 | 49.74 | 71 |
| 2004 | 48.09 | 79 |
| 2003 | 46.82 | 85 |
| 2002 | 46.57 | 87 |
| 2001 | 45.18 | 94 |
| 2000 | 45.86 | 87 |
| 1999 | 46.96 | 79 |
| 1998 | 48.53 | 70 |
| 1997 | 49.11 | 65 |
| 1996 | 49.04 | 68 |
| 1995 | 49.01 | 67 |
| 1994 | 51.32 | 57 |
| 1993 | 53.81 | 46 |
| 1992 | 57.4 | 37 |
| 1991 | 60.33 | 31 |