| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 50.7 | 107 |
| 2015 | 50.66 | 108 |
| 2014 | 50.6 | 109 |
| 2013 | 49.74 | 113 |
| 2012 | 48.91 | 114 |
| 2011 | 48.69 | 114 |
| 2010 | 46.78 | 126 |
| 2009 | 42.59 | 144 |
| 2008 | 42.16 | 144 |
| 2007 | 40.03 | 148 |
| 2006 | 39 | 149 |
| 2005 | 38.21 | 149 |
| 2004 | 37.26 | 151 |
| 2003 | 35.79 | 155 |
| 2002 | 34.47 | 160 |
| 2001 | 34.59 | 158 |
| 2000 | 35.36 | 156 |
| 1999 | 35.44 | 156 |
| 1998 | 35.28 | 153 |
| 1997 | 34.96 | 153 |
| 1996 | 34.03 | 154 |
| 1995 | 34.39 | 152 |
| 1994 | 35.51 | 149 |
| 1993 | 35.51 | 146 |
| 1992 | 33.88 | 153 |
| 1991 | 31.89 | 155 |
| 1990 | 32.1 | 155 |