| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 55.29 | 53 |
| 2015 | 55.69 | 52 |
| 2014 | 55.53 | 52 |
| 2013 | 54.5 | 55 |
| 2012 | 53.93 | 59 |
| 2011 | 52.88 | 59 |
| 2010 | 52.55 | 61 |
| 2009 | 51.84 | 68 |
| 2008 | 51.66 | 69 |
| 2007 | 50.62 | 74 |
| 2006 | 49.53 | 77 |
| 2005 | 48.98 | 77 |
| 2004 | 47.38 | 85 |
| 2003 | 46.98 | 84 |
| 2002 | 46.68 | 85 |
| 2001 | 47.44 | 79 |
| 2000 | 47.54 | 76 |
| 1999 | 46.59 | 81 |
| 1998 | 45.66 | 84 |
| 1997 | 45.77 | 85 |
| 1996 | 46.36 | 87 |
| 1995 | 46.01 | 86 |
| 1994 | 44.55 | 90 |
| 1993 | 42.14 | 101 |
| 1992 | 40.38 | 109 |
| 1991 | 39.58 | 111 |