| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2015 | 55.01 | 139 |
| 2014 | 55.1 | 146 |
| 2013 | 56.1 | 150 |
| 2012 | 57.03 | 152 |
| 2011 | 59.18 | 147 |
| 2010 | 58.23 | 145 |
| 2009 | 55.16 | 146 |
| 2008 | 64.34 | 139 |
| 2007 | 58.37 | 145 |
| 2006 | 59.57 | 145 |
| 2005 | 58.02 | 145 |
| 2004 | 58.8 | 142 |
| 2003 | 57.91 | 140 |
| 2002 | 62.66 | 123 |
| 2001 | 67.23 | 107 |
| 2000 | 68.52 | 107 |
| 1999 | 61.41 | 112 |
| 1998 | 57.9 | 113 |
| 1997 | 55.25 | 124 |
| 1996 | 55.12 | 116 |
| 1995 | 56.91 | 117 |
| 1994 | 58.81 | 105 |
| 1993 | 57.55 | 98 |
| 1992 | 59.23 | 94 |
| 1991 | 54.64 | 96 |
| 1990 | 52.61 | 102 |
| 1989 | 51.98 | 89 |
| 1988 | 48.4 | 86 |
| 1987 | 50 | 82 |
| 1986 | 52.77 | 77 |