| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 60.25 | 73 |
| 2015 | 60.64 | 71 |
| 2014 | 60.37 | 74 |
| 2013 | 59.77 | 79 |
| 2012 | 59.2 | 82 |
| 2011 | 58.43 | 89 |
| 2010 | 57.85 | 91 |
| 2009 | 57.07 | 98 |
| 2008 | 58.06 | 98 |
| 2007 | 57.05 | 103 |
| 2006 | 55.81 | 107 |
| 2005 | 55.11 | 107 |
| 2004 | 53.8 | 113 |
| 2003 | 53.06 | 115 |
| 2002 | 53.11 | 115 |
| 2001 | 54.36 | 112 |
| 2000 | 54.72 | 106 |
| 1999 | 54.29 | 109 |
| 1998 | 54.16 | 109 |
| 1997 | 55.01 | 103 |
| 1996 | 56.08 | 98 |
| 1995 | 56.51 | 94 |
| 1994 | 55.67 | 100 |
| 1993 | 53.5 | 118 |
| 1992 | 51.68 | 128 |
| 1991 | 51.67 | 130 |