| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 60.64 | 70 |
| 2015 | 60.64 | 72 |
| 2014 | 60.66 | 71 |
| 2013 | 60.44 | 73 |
| 2012 | 59.29 | 81 |
| 2011 | 58.63 | 86 |
| 2010 | 58.05 | 89 |
| 2009 | 57.68 | 93 |
| 2008 | 58.54 | 91 |
| 2007 | 59.01 | 86 |
| 2006 | 58.58 | 85 |
| 2005 | 58.02 | 88 |
| 2004 | 57 | 95 |
| 2003 | 55.87 | 102 |
| 2002 | 53.01 | 119 |
| 2001 | 56.19 | 99 |
| 2000 | 53.84 | 116 |
| 1999 | 52.91 | 121 |
| 1998 | 51.29 | 131 |
| 1997 | 50.98 | 134 |
| 1996 | 49.81 | 138 |
| 1995 | 48.41 | 148 |
| 1994 | 51.02 | 133 |
| 1993 | 50.49 | 138 |
| 1992 | 49.92 | 139 |
| 1991 | 49.9 | 139 |