| 时间 | 值 （%） | 世界排名 |
|---|---|---|
| 2016 | 53.3 | 90 |
| 2015 | 53.65 | 88 |
| 2014 | 53.33 | 91 |
| 2013 | 53.74 | 89 |
| 2012 | 51.09 | 103 |
| 2011 | 53.17 | 90 |
| 2010 | 51.54 | 100 |
| 2009 | 49.25 | 109 |
| 2008 | 48.99 | 108 |
| 2007 | 48.92 | 107 |
| 2006 | 46.26 | 128 |
| 2005 | 43.45 | 137 |
| 2004 | 42.74 | 136 |
| 2003 | 42.6 | 135 |
| 2002 | 41.45 | 138 |
| 2001 | 40.27 | 140 |
| 2000 | 38.73 | 144 |
| 1999 | 38.86 | 143 |
| 1998 | 38.9 | 143 |
| 1997 | 39.46 | 137 |
| 1996 | 40.99 | 132 |
| 1995 | 41.88 | 126 |
| 1994 | 42.02 | 127 |
| 1993 | 42.07 | 126 |
| 1992 | 41.79 | 124 |
| 1991 | 41.73 | 124 |
| 1990 | 40.72 | 126 |